JP2007074947A - Traveling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a walking type traveling vehicle having a relatively light pushing down load of a handle 2. <P>SOLUTION: This traveling vehicle is provided by installing a left and right pair of transmission cases 9, 9 housing a transmission mechanism for transmitting a power from an engine 5 to a left and right pair of traveling wheels 7, 7, actuators 15, 15 lifting each of the left and right traveling wheels 7, 7 up and down by rotating the transmission cases 9, 9 in up and down direction through linking mechanisms 9A, 9B; 9A, 9B and a left and right pair of side clutches for cutting each of the transmissions to the left and right pair of the traveling wheels 7, 7, and also giving a play consisting of a slot 15a and a pin 9Ba of a shaft 9B engaged with the slot 15a in the linking mechanisms 9A, 9B of the actuator 15 at the outside of revolution with the transmission case 9 so as to further descend the transmission case 9 at the outside of the revolution by the reaction force of driving of the traveling wheel 7 at the outside of the revolution. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a traveling vehicle belonging to the technical field of field seedling transplanting machines.

Openable / closable beak-shaped seedling planting tool that moves up and down in conjunction with a link mechanism that drives up and down, a walking type seedling transplanter that includes a steering mechanism and a transmission mechanism such as an engine and a chain that transmits power from the engine to the wheels Machine.
Japanese Patent Laid-Open No. 11-4602

A walking-type seedling transplanter that transplants seedlings such as green onions, when turning, turns the aircraft while pushing down the handle at the rear of the aircraft to lift the front wheels off the ground.
However, the green onions are seedlings that are planted in the valleys or flat areas of the ridges, not on the ridges. When the length of the handle is relatively short, the rising angle becomes small, so that the load of pushing down the handle becomes heavy. In addition, when a long seedling transplanter such as a green onion is provided with a relatively long transmission case in the front-rear direction, the front wheel needs to be lifted sufficiently high at the time of turning, but the handle pushing load increases accordingly.
An object of the present invention is to provide a walking-type traveling vehicle in which a handle pressing load is relatively light.

The above-described problems of the present invention are solved by the following solution means.
The present invention relates to an engine (5) on a vehicle body, a handle (2) at the rear end of the vehicle body, a pair of left and right traveling wheels (7, 7), and a pair of left and right traveling wheels ( 7 and 7), a pair of left and right transmission cases (9, 9) that house transmission mechanisms for transmission, respectively, and the transmission cases (9, 9) via transmission mechanisms (9A, 9B; 9A, 9B) A pair of left and right actuators (15, 15) that move the left and right traveling wheels (7, 7) up and down by rotating (9, 9) in the vertical direction, and the traveling wheels (7) inside the turn when turning A pair of left and right side clutches respectively corresponding to the left and right traveling wheels (7, 7) that cut off the power transmission are provided, and a transmission case (9) outside the turning further lowered by the driving reaction force of the traveling wheels (7) outside the turning. With the actuator (15) on the outside of the turn to descend A traveling vehicle which gave play coupling mechanism (9A, 9B) of a moving casing (9).

  In the traveling vehicle of the present invention, when the side clutch inside the turning is disconnected during turning and the driving reaction force of the traveling wheel (7) inside the turning becomes zero, the traveling wheel (7) inside the turning only slightly rises. Yes, so the inside of the fuselage is only slightly lowered. However, a driving reaction force acts on the traveling wheel (7) outside the turn where the side clutch is not disconnected, and the reaction force causes the rear end of the transmission case (9) outside the turn to move in the direction of the arrow (A) in FIG. Try to rotate to the bottom. At this time, the transmission case (9) moves in the direction of the arrow (b), but there is play in the coupling mechanism (9A, 9B) between the transmission case (9) and the cylinder (15) on the outer side of the turn, so that play is During this period, the rear end of the transmission case (9) does not act to suppress the rotation in the direction of the arrow (A), so that the descending amount of the traveling wheel (7) outside the turn is not restricted. For this reason, the descending amount of the traveling wheel (7) on the outside of the turn is relatively large, and therefore, the airframe rises greatly on the outside of the turn compared to the inside of the turn, and the airframe is inclined to the inside of the turn, so that the turn is easy to turn.

  According to the present invention, it is possible to obtain a traveling vehicle that has a relatively simple structure, requires a relatively small pushing force on the steering wheel during turning, and has good turning steerability.

In an embodiment of the present invention, a seedling transplanting machine for planting seedlings such as green onions in a groove portion or flat ground between ridges will be described with reference to the drawings.
1 and 2 show a side view and a plan view of a seedling transplanter according to an embodiment of the present invention.

  In the description of the present embodiment, when referring to the front or rear, the side on which the steering handle 2 is disposed is the rear, and the opposite side, that is, the side on which the engine 5 is disposed is the front. When the term “right” or “left” is used, the right hand side is referred to as the right and the left hand side is referred to as the left when viewed from the operator standing at the front of the aircraft at the front of the aircraft.

  The seedling transplanting device 4 includes a machine body including the traveling device 1 and the steering handle 2, and a seedling planting device 4 including a beak-shaped seedling planting portion 4 a that can be opened and closed by connecting to a link mechanism 3 that is driven to move up and down. It is set as the structure which provided.

  In the illustrated example, the traveling device 1 includes an engine 5, a pair of left and right rear wheels 7 and 7 that are driven and rotated by transmission of the power of the engine 5, and a pair of left and right front wheels 6 and 6 that are rotatably supported. It is supposed to be prepared.

  A mission case 8 is disposed at the rear of the engine 5, and the mission case 8 has a case portion extending from the left side of the engine 5 to the left side of the engine 5, and this is connected to the left side of the engine 5. The output shaft of the engine 5 enters the case portion and the power is transmitted to the transmission mechanism in the transmission case 8. The transmission case 9, 9 is rotatably attached to the left and right side portions of the transmission case 8, and the tip of the wheel drive shaft 9A is extended from the transmission case 8 to the left and right outer sides at the rotation center of the transmission case 9, 9. Enters the transmission case 9, 9 to transmit power for traveling. The driving power is transmitted to the axles 10 and 10 that extend to the rear side of the machine body and project to the side of the rear end side through the transmission mechanism in the transmission cases 9 and 9, and the rear wheels 7 and 7 are driven to rotate. It is supposed to be.

Also, upwardly extending arms 9B and 9B are integrally attached to the attachment portions of the transmission cases 9 and 9 to the transmission case 8, and the lifting and lowering hydraulic cylinders 15 are rotatable on the arms 9B and 9B, respectively. It is connected. At the tip of the piston rod 15a of the lifting / lowering hydraulic cylinder 15, a horizontal bar 13 fixed to the airframe is attached.
Further, hunting that is likely to occur during automatic horizontal control of the aircraft is prevented by operating the horizontal control of the aircraft by a manual lever 23 provided on the handle 2.

Further, when the elevating hydraulic cylinder 15 is actuated and the piston rod 15a is contracted, the transmission cases 9 and 9 are rotated downward and the airframe is raised.
On the other hand, when the piston rod 15a of the lifting hydraulic cylinder 15 protrudes, the left and right arms 9B, 9B rotate forward, and accordingly, the transmission cases 9, 9 rotate upward, and the fuselage descends. . The lifting / lowering hydraulic cylinder 15 is configured to actuate the aircraft to a set height with respect to the farm scene based on the detection result of the sensor S0 that detects the height of the farm scene relative to the aircraft. It is also configured to operate so as to raise or lower the fuselage by manipulating an operation tool disposed in the vicinity of 2.

  Further, the front wheel 6 having a flat front wheel surface is in contact with the floor surface of the groove to flatten the floor surface of the groove. Since the sensor S0 senses the height of the groove floor after being flattened, the sensor S0 appropriately detects the height of the groove floor, so that the airframe is adjusted relative to the height of the groove floor based on the detection result. Can be operated to set height. Therefore, it can also be used to control the seedling planting depth. In addition, protrusion S0a for making a planting groove | channel on a groove floor surface was provided in the center part of the bottom face of sensor S0. For this reason, it is easy to insert the tip of the seedling planting tool 4a at the seedling planting position into the groove floor surface.

  The control valve interlocking member for the hydraulic cylinder 15 is connected to the main hydraulic cable 12 when the airframe passes through the end of the kite and the kite sensor S1 is lowered by a predetermined amount or less about the rotation fulcrum S1a. When the cable is pulled, the hydraulic cylinder 15 is actuated to rotate the rear wheel 7 downward about the wheel drive shaft 9A to raise the machine body.

  When the left and right horizontal control hydraulic cylinders 15 extend and retract to different positions, the left and right transmission cases 9 and 9 are moved up and down alternately to tilt the aircraft to the left and right. The left / right horizontal control hydraulic cylinder 15 is configured to operate so that the airframe is in a desired left / right inclined posture based on the operation of the manual lever 23.

The pair of front wheels 6 and 6 are rotatably attached to an axle 17 attached to a pair of left and right front wheel support frames 16 supported by the vehicle body.
The steering handle 2 is attached to the rear end portion of the body frame 14 whose front end portion is fixed to the mission case 8. The body frame 14 is disposed at a position deviated from the right and left center of the body to the right side and extends rearward, and extends obliquely rearward and upward from the front and rear intermediate portion. The steering handle 2 extends rearward from the rear end portion of the body frame 14 to the left and right, and the rear end portions thereof serve as grip portions 2 a and 2 a of the steering handle 2. The left and right grip portions 2a, 2a of the steering handle 2 are set to an appropriate height so that the operator can easily grip the grip portions 2a, 2a with hands. In the illustrated example, the grip portions 2a and 2a are divided into left and right. However, the left and right rear end portions of the steering handle 2 may be connected to each other left and right, and the connecting portions may be used as the grip portions 2a and 2a.

  The link mechanism 3 is attached to a planting transmission case 18 that includes a transmission mechanism that receives power for driving a seedling planting tool from the mission case 8 and transmits it. As shown in the figure, the planting transmission case 18 has a front portion connected to the rear portion of the transmission case 8 and is fixed to a first case portion 18a extending obliquely upward and rearward from the first case portion 18a and an upper left portion of the first case portion 18a. A second case portion 18b extending to the left side, a third case portion 18c fixed to the left end portion of the second case portion 18b and extending rearward and obliquely downward, and an outer portion of the lower end portion of the third case portion 18c. A fourth case portion 18d that is fixed and extends to the left side and a fifth case portion 18e that is fixed to the left end portion of the fourth case portion 18d and extends horizontally rearward are provided. The first case portion 18a to the fifth case portion 18e have a transmission mechanism that transmits power for driving the link mechanism 3 up and down.

  The transmission mechanism built in the first case portion 18a includes an intermittent drive mechanism that stops the link mechanism 3 and the seedling planting device 4 at the uppermost position of the raising / lowering movement or at a position in the vicinity thereof, and a link. And a clutch mechanism for stopping the lifting and lowering of the mechanism 3 and the seedling planting device 4. The time for stopping by the intermittent drive mechanism is adjusted by a speed change mechanism provided in the intermittent drive mechanism, and the adjustment between the seedling planting stocks by the seedling planting device 4 is adjusted by this adjustment.

  The link mechanism 3 is provided on the rear side of the seedling planting device 4 and the first lifting arm 20 that is rotatably connected to the left and right intermediate portion of the left and right shaft 19 provided on the front side of the seedling planting device 4. And a second elevating arm 22 rotatably connected to the left side of the left and right shaft 21.

  Although details are omitted, the first elevating arm 20 and the second elevating arm 22 move up and down while swinging. As a result, the lower end of the seedling planting device 4 has a substantially elliptical locus that is long in the side view. Move up and down at T.

  The seedling planting device 4 is provided with a beak-shaped seedling planting portion 4a that extends downward and opens in the left-right direction. Then, the seedling planting device 4 that stores the fallen seedling is lowered by the link mechanism 3 according to a substantially elliptical trajectory T that is vertically long in a side view and inserted into the field, and the right and left beak-shaped seedling planting units When 4a opens in the left-right direction of the machine body, the seedling is planted in the field, and thereafter the seedling planting device 4 is raised.

  The lower end portion of the seedling planting device 4 is moved up and down in a substantially elliptical locus T in a counterclockwise direction when viewed from the left side. Accordingly, when the seedling planting device 4 is moved up and down so as to draw the locus T in the above rotation direction while traveling, the lower end portion of the seedling planting device 4 at the lower end of the locus T is in the soil of the straw U in the field. A seedling planting device 4 having a beak-shaped seedling planting portion 4a is opened in the left-right direction of the machine body and releases the seedlings in the seedling planting device 4 to the soil of the cocoon U. Therefore, the soil brought to the slope of the adjacent ridge in the left-right direction of the seedling by the seedling planting device 4 easily flows into the periphery of the seedling again, and is more easily covered with the pressure-reducing wheels 38 and 38. Moreover, by opening the body in the left-right direction, it is possible to prevent the seedling planting device 4 from hitting the seedling planted when the seedling is planted in the soil of the groove and then ascending and disturbing the planting posture of the seedling. it can. This is particularly effective when planting long seedlings such as green onions.

  The seedling supply device 40 transmits power from the engine 5 by connecting one rotating shaft 51a of the sprockets 51, 51 and the first case portion 18a via the transmission shaft 53 to rotate the left and right sprockets 51, 51. The seedling supply cup 41 is driven to move around.

  A large number of seedling supply cups 41 are connected at equal intervals above the seedling supply device 40, and guide bodies 42, 42 that guide the movement of the seedling supply cup 41 along the circular movement trajectory are moved around the seedling supply cups 41. Provided inside and outside the trajectory, respectively. Thereby, the revolving movement of the seedling supply cups 41 is performed accurately and smoothly.

  An operator who operates the handle can operate the main clutch lever 27 provided on the handle 2 to perform on / off operation of the main clutch. Since the sub-clutch lever 28 is provided in the vicinity of the seedling guide body 42 so that the operator can also perform the main clutch on / off operation, the operator during the seedling supply operation also immediately performs the main clutch on / off operation. Therefore, an operator who is performing seedling supply work, for example, to avoid some danger can also stop the work travel.

The seedling transplanter is a seedling transplanter for groove planting in which seedlings are planted in the center of the groove between the ridges U, and a pair of left and right front wheels 6 and 6 and rear wheels 7 and 7 run in the groove between the ridges. .
Then, the seedling planting device 4 plants seedlings on the inner side in the left-right direction of the machine body, that is, on the soil portion not traveling on the front wheels 6, 6 from the ground contact point of the pair of left and right front wheels 6, 6.
By adopting such a configuration, seedlings can be planted in a place where the pair of front wheels 6 and 6 are not stepped on.

  Cylinders 15 and 15 for rotating the left and right transmission cases 9 and 9 in the vertical direction are provided, and side clutches (not shown) for cutting off engine power are provided in the left and right transmission cases 9 and 9, respectively. ing.

  3 shows a partial side view of the left transmission case 9 and the left cylinder 15 of FIG. 1. The left cylinder 15 is connected to a connecting shaft 9B provided upright on the wheel drive shaft 9A, and the connecting shaft 9B The tip of the shaft is locked to a long hole 15b provided at the tip of the left cylinder 15 by a pin 9Ba, and the pin 9Ba at the tip of the connecting shaft 9B is configured to be able to rotate in the direction of the arrow (b) within the long hole 15b. .

  Due to the above configuration, when the side clutch inside the turning is cut during turning of the seedling transplanter and the driving reaction force of the rear wheel 7 inside the turning becomes zero, the rear wheel 7 inside the turning only rises a little, so that the fuselage The inside is only slightly lowered. However, a driving reaction force acts on the rear wheel 7 on the outside of the turn, and the reaction force causes the rear end portion of the left transmission case 9 on the outside of the turn to rotate in the direction of arrow (A) (downward). At this time, the locking pin 9Ba of the connecting shaft 9B provided on the axle drive shaft 9A on the front end side of the transmission case 9 outside the turning moves the elongated hole 15b of the left cylinder 15 in the arrow (b) direction. While 9Ba moves in the long hole 15b, the rear end portion of the left transmission case 9 does not have a force to suppress the rotation in the direction of the arrow (A), so the lowering amount of the rear wheel 7 on the outside of the turn is restricted. Absent. For this reason, the descending amount of the traveling wheel (7) on the outer side of the turn becomes relatively large. Therefore, the left side of the aircraft is greatly increased compared to the right side, and the aircraft is inclined to the inner side of the turn. The pushing-down force of the handle 2 can be relatively small.

  In the leek transplanter, the transmission case 9 of the deceleration type is too long when the transmission case 9 of the seedling transplanter for other crops is used. However, since the transmission case 9 of the seedling transplanter for crops other than green onions is shared for cost reduction, the axle drive shaft 9A ′ serving as the rotation center of the transmission case 9 is used for the green onion transplanter other than the green onions. The balance of the transmission case 9 for the leek transplanter can be maintained by adopting a configuration in which the transmission case 9 for the crop is shifted slightly rearward from the axle drive shaft 9A.

FIG. 4 is a diagram showing a transmission mechanism in the transmission case 9 for that purpose, FIG. 4 (a) shows a configuration for leeks, and FIG. 4 (b) shows a configuration for crops other than green onions.
The configuration for the onion in FIG. 4A is that the engine-side power is input from the axle drive shaft 9A ′ of the transmission case 9 to the drive shaft 9A via the chain 78 from the sprocket 77 provided on the axle drive shaft 9A ′. It is configured to be transmitted to the provided sprockets 79 and 80 and to transmit power from the sprocket 80 to the axle 10 via the chain 81. 4 (b) is driven by a chain 78 from a sprocket 79 provided on the axle drive shaft 9A by inputting engine-side power from the axle drive shaft 9A of the transmission case 9. It is configured to be transmitted to sprockets 77, 82 provided on the shaft 9 </ b> A ′, and to transmit power from the sprocket 82 to the axle 10 via the chain 83.

  As shown in FIG. 4, the size of each transmission case 9 for green onions and non-green onions does not change, but for green onions, as shown in FIG. The shaft 9A ′ is shorter in distance from the axle 10 than the wheel drive shaft 9A for other than the onion, and therefore compared with the case where the wheel drive shaft 9A shown in FIG. Thus, the vertical turning radius of the axle 10 is shortened.

  In the transmission configuration between the wheel drive shafts 9A and 9A ′ and the axle 10 shown in FIGS. 4 (a) and 4 (b), respectively, the two wheels are decelerated and transmitted in two stages to drive the wheels. The shafts 9A and 9A ′ are configured to transmit from the axle 10 respectively. This is a configuration for preventing the transmission accuracy from deteriorating due to an excessively large difference in diameter between the driving sprocket and the driven sprocket when one chain is immediately decelerated to a desired speed.

  Further, in the leek transplanter of this embodiment, the front wheel support frame 16 has an arrow on the inner side of the steering shaft 17 that is the steering center of the front wheel 6 so that the steering direction can be easily understood when the front wheel 6 is steered. A molded front wheel steering lever 71 is provided. The front wheel steering lever 71 is provided with an operating portion in the vicinity of the handle 2, and the front wheel steering lever 71 is provided with a pair of left and right side clutch levers 72, 72 for manually operating the side clutches of the left and right rear wheels 7, 7. The front wheel steering lever 71 is supported by a lever guide 73 attached to the transmission case 18e.

  Accordingly, the direction of the front wheel 6 can be easily grasped by the front wheel steering lever 71, and the front wheel steering lever 71 is provided on the inner side of the front wheel 6, so that the front wheel steering lever 71 is attached to other structures around the body. Can be prevented from interfering with each other.

  As shown in FIG. 2, the pair of left and right side clutches of the rear wheels 7 and 7 are turned on and off by operating the side clutch lever 72. When the side clutch is not used, only the front wheel 6 is steered by operating the central lever 74 without the side clutch lever.

  The traveling vehicle of the present invention can be used as a transplanter for seedlings to be planted in a groove between flats such as a leek seedling or a flat ground.

It is a side view of the seedling transplanting machine of one Example of this invention. It is a top view of the seedling transplanting machine of FIG. It is a side view which shows the connection mechanism of the rear-wheel transmission case of the seedling transplanter of FIG. FIG. 4 is a transmission mechanism diagram in a transmission case of a seedling transplanter that can be shared by green onions and other crops (FIG. 4A is a configuration for green onions and FIG. 4B is a configuration for crops other than green onions).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling device 2 Steering handle 3 Link mechanism 4 Seedling planting device 4a Seedling planting part 5 Engine 6 Front wheel 7 Rear wheel 8 Transmission case 9 Transmission case 9A, 9A 'axle drive shaft 9B Connection shaft 9Ba Pin 10 Axle 12 Main hydraulic cable 13 Recumbent 14 Machine frame 15 Hydraulic cylinder 15a Piston rod 15b Long hole 16 Front wheel support frame 17 Axle 18 Planting transmission case 19 Left / right direction shaft 20 First lifting / lowering arm 21 Left / right direction shaft 22 Second lifting / lowering arm 23 Manual lever 27 Main clutch lever 28 Sub clutch lever 38 Pressure reducing wheel 40 Seedling supply device 41 Seedling supply cup 42 Guide body 51 Sprocket 53 Transmission shaft 71 Front wheel steering lever 72 Side clutch lever 73 Lever guide 74 Lever 77, 79, 80, 82 Sprocket 78, 81, 83 Over down U ridges S0 sensor S0a projection S1 ridges on the sensor S1a pivot point

Claims (1)

Engine (5) on the vehicle body, handle (2) at the rear end of the vehicle body, a pair of left and right traveling wheels (7, 7), and a pair of left and right traveling wheels (7, 7) And a pair of left and right transmission cases (9, 9) each housing a transmission mechanism for transmitting to the transmission case (9, 9B) via the connecting mechanism (9A, 9B; 9A, 9B). ) In the vertical direction to cut the power transmission to the pair of left and right actuators (15, 15) that move the left and right traveling wheels (7, 7) up and down, and the traveling wheels (7) inside the turn when turning. A pair of left and right side clutches respectively corresponding to the left and right traveling wheels (7, 7);
Connecting mechanism (9A, 9B) between the actuator (15) outside the turning and the transmission case (9) so that the transmission case (9) outside the turning lowered by the driving reaction force of the traveling wheel (7) outside the turning further descends. ) Is a traveling vehicle characterized by having play.

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