JP4492587B2 - Seedling transplanter - Google Patents

Description

The present invention relates to a seedling transplanter including a rear wheel.

Conventionally, in a traveling vehicle of a riding type rice transplanter, for example, when the left and right rear wheels are supported so as to be able to swing up and down, and the seedling planting portion at the rear of the aircraft is raised from the rice field to a predetermined non-working position when turning, By lowering the left and right rear wheels in conjunction with the operation, the rear part of the aircraft is lifted to make the aircraft appear to be lowered forward (see Patent Document 1).
JP 2004-275059 A

  The above-mentioned conventional lifting of the rear part of the fuselage is a structure that is linked to the top and bottom of the planting part, and when the planting part is raised, it operates regardless of forward and backward movement, so when going over the heel by reverse traveling or climbing Ayumi, On the other hand, there was a problem of poor balance. In addition, since the rear part of the aircraft cannot be lifted during the planting operation with the planting part lowered, there is a problem that the aircraft is in a front-up posture or the seedling planting posture is deteriorated.

  In the present invention, a mechanism for automatically lowering the rear wheels to correct the front / rear tilt posture of the airframe is configured simply by suppressing an increase in weight and cost of the airframe.

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 vehicle body (2) provided with left and right front wheels (3) and left and right rear wheels (4), and a seedling planting portion that can be raised and lowered behind the vehicle body (2) ( 7) and left and right rear wheel transmission cases (34) provided with rear wheel axles (56) and left and right rear wheel transmission shafts (33) transmitting from the front side to the input shaft (34b) of the rear wheel transmission case (34). ), And 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 sides . (50) and the second support member (51) are provided to support the rotation fulcrum shaft (54) in the left-right direction, and the second support member (51) is configured to be detachable from the body frame (49). , the rear wheel transmission case (34) provided with a hole for inserting the rotation fulcrum shaft (54), the pivot The rear wheel transmission case (34) is moved between the first support member (50) and the second support member (51) so that the rear wheel axle (56) is positioned behind the point shaft (54). A third support member (55) is mounted so as to be pivotable up and down around the moving fulcrum shaft (54), and extends rearward from the body frame (49). A rear wheel is provided on the lower surface of the third support member (55). An elastic member (60) that contacts the transmission case (34) is provided, a regulating pin (57) is provided on the rear wheel transmission case (34), and a support shaft (59) is provided on the third support member (55), A restricting arm (58) rotatable around the support shaft (59) is provided, a restricting pin (57) is inserted into a long hole (58a) provided in the restricting arm (58), and a restricting pin ( regulating the vertical pivoting range of the rear wheel transmission case (34) by 57) and restricting arm (58) And forming, with a bendable joint to accommodate the vertical rotation of the rear wheel transmission case to rear transmission shaft (33) (34) (33a), a rear wheel axle (56) after possible the uppermost position When the wheel transmission case (34) rotates upward, the joint (33a) is bent so as to be concave upward, and the rear wheel transmission case (34) is positioned on the lower side so that the rear wheel axle (56) is at the lowest position. The joint (33a) is bent so as to be recessed downward, and the rear wheel axle (56) is the highest than the bending angle of the joint (33a) when the rear wheel axle (56) is at the bottom. The seedling transplanting machine is configured so that the bending angle of the joint (33a) becomes smaller.

In this seedling transplanter, when beyond ridge in advance of the aircraft, during forward movement in the loading or during plowing machine deep field in the track in advance, when the driving load more than a predetermined rear wheel 4 occurs, The driving reaction force causes the rear wheel transmission case 34 to rotate downward and the rear wheel 4 to move downward, preventing the vehicle body from being lifted forward and the front wheel 3 from being lifted. In addition, since the second support member 51 is configured to be detachable from the body frame 49, the second support member 51 on the outer side in the left-right direction is removed from the outer side in the left-right direction of the body along the rotation fulcrum shaft 54. The rear wheel transmission case 34 can be easily attached and detached. Further, when the rear wheel transmission case 34 is turned upward so that the rear wheel axle 56 is in the uppermost position, the joint 33a is bent so as to be concave upward, and the rear wheel axle 56 is bent in the lowermost position so that the rear wheel axle 56 is in the lowest position. Since the joint 33a is bent so as to be recessed downward when the ring 34 is rotated downward, the bending direction of the rear wheel transmission shaft 33 is divided up and down in the vertical rotation of the rear wheel transmission case 34. The bending angle of the rear wheel transmission shaft 33 can be set as small as possible throughout the entire vertical rotation of the rear wheel transmission case 34. Further, the bending angle of the joint 33a of the rear wheel transmission shaft 33 is smaller when the rear wheel axle 56 is at the uppermost position than the bending angle of the joint 33a of the rear wheel transmission shaft 33 when the rear wheel axle 56 is at the lowest 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 rotates upward due to the weight of the fuselage, and the rear wheel axle 56 is in the uppermost position. The bending angle of the joint 33a of the ring transmission shaft 33 is reduced.

Further, the invention according to claim 2 is an upper and lower divided case (34) that divides the rear wheel transmission case (34) at a position between the hole for inserting the rotation fulcrum shaft (54) and the rear wheel axle (56). The seedling transplanting machine according to claim 1, wherein the seedling transplanting machine is configured as shown in 34a).

In the invention according to claim 3, the distance between the rotation fulcrum shaft (54) and the rear wheel axle (56) is reduced so that the rotation fulcrum shaft (54) is within the outer diameter of the rear wheel (4). It was set as the seedling transplanter of Claim 1 or 2 set.

In the invention according to claim 4, the left and right rear wheel transmission cases (34) can be turned up and down in conjunction with the operation of the brake pedal (32) for braking the front wheels (3) and the rear wheels (4). The seedling transplanting machine according to any one of claims 1 to 3, which is configured to be regulated.

According to the first aspect of the present invention, since the rear wheel transmission case 34 is provided with a hole for inserting the rotation fulcrum shaft 54, the rear wheel transmission case (34) can be rotated up and down . When moving forward over a ridge, when loading on a truck in advance, or when moving forward in a field where the cultivator is deep, the rear wheel 4 is moved downward by the driving reaction force, and the aircraft is in a front-up position and the front wheel It is possible to prevent such a situation that 3 rises or the seedling transplanting posture deteriorates in the traveling vehicle of the seedling transplanter . , Ease detachment of the rear wheel transmission case 34 from the lateral direction outside the body by removing the left-right direction outer side of the second support member 51 along the rotation fulcrum shaft 54, thus improving maintainability. Further, since the bending direction of the rear wheel transmission shaft 33 is divided up and down in the vertical rotation of the rear wheel transmission case 34, the bending angle of the rear wheel transmission shaft 33 in the entire vertical rotation region of the rear wheel transmission case 34 is provided. Can be set as small as possible, 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. Further, the bending angle of the joint 33a of the rear wheel transmission shaft 33 is smaller when the rear wheel axle 56 is at the uppermost position than the bending angle of the joint 33a of the rear wheel transmission shaft 33 when the rear wheel axle 56 is at the lowest 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 rotates upward due to the weight of the fuselage, and the rear wheel axle 56 is in the uppermost position. Since the bending angle of the joint 33a of the wheel transmission shaft 33 is small, the transmission loss due to the rear wheel transmission shaft 33 can be reduced, and the transmission to the rear wheel transmission case 34 can be improved. Further, a third support member 55 extending rearward from the body frame 49 is provided, and an elastic member 60 that contacts the rear wheel transmission case 34 is provided on the lower surface of the third support member 55. A pin 57 is provided, a support shaft 59 is provided on the third support member 55, a restricting arm 58 that is rotatable around the support shaft 59 is provided, and the restricting pin 57 is provided in a long hole 58 a provided in the restricting arm 58. Inserted and configured to restrict the vertical rotation range of the rear wheel transmission case 34 by the restriction pin 57 and the restriction arm 58, so that normal driving with a small driving load on the rear wheel 4 is possible even when the vehicle is moving backward and forward. In some cases, the rear wheel transmission case 34 is moved up to a position where the restriction pin 57 hits the upper end of the long hole 58a of the restriction arm 58 by its own weight, and the rear wheel 4 is in the uppermost state. At this time, the rear wheel transmission case 34 abuts against the elastic member 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 when the regulating pin 57 hits the lower end of the long hole 58a of the regulating arm 58.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the upper and lower divided cases 34a are divided at positions where the hole for inserting the rotation fulcrum shaft 54 and the rear wheel axle 56 are sandwiched. The

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, the rear wheel transmission case 34 can be rotated downward by the driving reaction force of the rear wheel 4.

According to the invention of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, the rear wheel 4 can be fixed so as not to move up and down when the vehicle is stopped.

A seedling transplanter 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 application device 8 is provided at the rear of the vehicle body 2, and the 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 to each strip by the pressure air 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 hose 12, and fertilizes. A driver's 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.

  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.

  Since the front wheel 3 includes a plurality of (three) spokes 3a and has a space inside each of the spokes 3a, the spoke 3a lifts up the mud that enters the space and causes the field to be roughened by running the aircraft. There is. Therefore, a configuration is known in which a foil disk that blocks the space is attached to the front wheel 2 to prevent the mud from being lifted by the spokes 3a. However, mud adheres to the wheel disk, and the mud falls to roughen the field and run. There is a risk of resistance. In particular, since the rotational center of the wheel disk accompanying the rotation of the front wheel 3 has a small amount of rotational movement, the amount of mud adhering increases. Therefore, the wheel disk 16 shown in FIG. 3 has a circular hole 16a at the center and lacks the center of rotation of the wheel disk with a large amount of mud adhering to prevent the mud from being lifted by the spoke 3a. On the other hand, it is possible to prevent the mud from adhering to the wheel disk 16, and it is possible to prevent the mud from adhering to the wheel disk 16 from damaging the farm field or causing running resistance.

  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 rotational power of the engine 15 is transmitted from an engine output pulley 25 to an input pulley 28 and an input shaft 29 of a hydraulic continuously variable transmission (HST) 27 via a belt 26. The hydraulic pump is driven via a transmission shaft provided on the core, and further, the hydraulic pump is transmitted from the output shaft of the hydraulic continuously variable transmission 27 to the mission input shaft of the mission case 30. ing.

  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 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. The ground before the planting is leveled by driving the leveling rotor 38. 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. 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.

  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 support member 55 that is U-shaped in back view and extends 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 34 a that is divided at a position sandwiching the rear wheel axle 56, and is shared by the left and right rear wheel transmission cases 34. Has been. 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.

  As described above, with this rice transplanter 1, during normal planting, the rear wheel 4 is in the uppermost state under normal traveling load, and the wheel is deeper than the front wheel 3 when the plow is deep and an excessive traveling load is applied. Due to the factors that the rear wheel 4 with a large shared load sinks deeply into the field and the driving reaction force of the rear wheel 4, the aircraft tends to be in a front-up position, but when the rear wheel 4 is in the downward movement state, The forward raising posture is corrected, and it is possible to prevent the seedling planting posture from being disturbed by the settlement of the planting unit 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.

  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 operates the said compression spring in the whole vertical rotation area of the rear-wheel transmission case 34. 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.

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

1: 4 Ueda transplanter (seedling transplanter), 2: car body, 3: front wheel, 4: rear wheel, 7: seedling planting part, 32: brake pedal, 33: rear wheel drive shaft, 33a: joint, 34 : Rear wheel transmission case, 34a: split case, 34b: input shaft of rear wheel transmission case, 49: rear frame, 50: first support member, 51: second support member, 54: rotation fulcrum shaft, 55: first Three support members 56: Rear wheel axle 57: Restriction pin 58: Restriction arm 58a: Long hole 59: Support shaft 60: Cushion rubber

Claims (4)

A vehicle body (2) having left and right front wheels (3) and left and right rear wheels (4) is provided, and a seedling planting portion (7) that can be raised and lowered is provided behind the vehicle body (2), and a rear wheel axle (56 Left and right rear wheel transmission cases (34) and left and right rear wheel transmission shafts (33) that are transmitted from the front to the input shaft (34b) of the rear wheel transmission case (34). 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 disposed on the left and right sides, and project from the left side to the left side. ) Is provided to support the left and right rotation fulcrum shaft (54), and the second support member (51) is configured to be detachable from the fuselage frame (49). The rear wheel transmission case (34) wherein a hole for inserting the rotation fulcrum shaft (54) is provided, the rear axle to the rear side than the rotation supporting point shaft (54) 56) can be rotated up and down around the rotation fulcrum shaft (54) between the first support member (50) and the second support member (51) so that the rear wheel transmission case (34) is positioned. And a third support member (55) extending rearward from the body frame (49) is provided, and an elastic member (60) contacting the rear wheel transmission case (34) is provided on the lower surface of the third support member (55). The rear wheel transmission case (34) is provided with a restriction pin (57), the third support member (55) is provided with a support shaft (59), and is freely restricted around the support shaft (59). The control pin (57) is inserted into the long hole (58a) provided in the control arm (58), and the rear wheel is transmitted by the control pin (57) and the control arm (58). a structure for restricting the vertical pivoting range of the case (34), to the rear wheel transmission shaft (33) When the rear wheel transmission case (34) is rotated upward as much as possible so that the rear wheel axle (56) is in the uppermost position with a bendable joint (33a) so as to adapt to the vertical rotation of the wheel transmission case (34). The joint (33a) is bent so as to be concave upward, and when the rear wheel transmission case (34) is rotated downward so that the rear wheel axle (56) is at the lowest position, the joint (33a) is on the lower side. The bending angle of the joint (33a) when the rear wheel axle (56) is at the top is smaller than the bending angle of the joint (33a) when the rear wheel axle (56) is at the bottom. A seedling transplanter with the following structure. The rear wheel transmission case (34) is composed of a hole for inserting the rotation fulcrum shaft (54) and an upper and lower divided case (34a) that divides at a position sandwiching the rear wheel axle (56). The seedling transplanter described in 1. The distance between the rotation fulcrum shaft (54) and the rear wheel axle (56) is set to be small so that the rotation fulcrum shaft (54) is within the outer diameter of the rear wheel (4). Seedling transplanter. A structure in which the vertical rotation of the left and right rear wheel transmission cases (34) is regulated in conjunction with the operation of a brake pedal (32) for braking the front wheels (3) and the rear wheels (4). The seedling transplanter according to any one of the above.

Images