JP2008228707A - Walking type rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a walking type rice transplanter capable of improving operation efficiency by multi-row planting while suppressing heaviness of operation resulting from multi-row planting. <P>SOLUTION: A seedling-planting apparatus 4 is installed in the rear of a machine body frame 2 and wheels 3 are arranged at the position on front side of a machine body than the seedling-planting apparatus 4 in the machine body frame 2 and power from an engine 1 is transmitted through a transmission case 8 to the wheels 3 and the seedling-planting apparatus 4, and the transmission case 8 is arranged so as to position on the front side of the machine body than front side end 3a of the machine body of the wheels 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is equipped with a seedling planting device at the rear of the machine frame, and a wheel is disposed at a position in front of the machine body relative to the seedling planting device in the machine frame. It is related with the walk-type rice transplanter comprised so that the motive power of might be transmitted via a mission case.

In the walking type rice transplanter as described above, heavy objects such as an engine and a mission case are provided on the front side of the body frame in order to balance the front-rear balance of the body. In addition, in order to shorten the overall length of the aircraft as much as possible, a state in which those heavy objects are brought closer to the front and rear center side of the aircraft, specifically, some heavy objects such as a mission case are placed more than the front end of the wheels in the aircraft. They are deployed in a state where they are partially or wholly inserted into the rear region (see, for example, Patent Documents 1 and 2).
JP 2006-81538 A JP-A-6-62627

  In recent years, it has been desired to increase the number of walking type rice transplanters in order to increase the efficiency of work while suppressing the increase in expenses. However, in the walking type rice transplanter as described above, if the number of seedlings is simply increased by increasing the number of seedling planting devices, the seedling planting device becomes larger and the weight on the rear side of the machine body becomes heavier. The balance of the front and rear of the aircraft centered on the back is closer. For this reason, the handle load when operating the walking type rice transplanter from the rear of the machine body becomes heavy, and the labor becomes more laborious.

  An object of the present invention is to make it possible to improve the work efficiency of a walking type rice transplanter while suppressing the heavy labor of the work caused by the multiple lines.

In order to achieve the above object, in the invention according to claim 1 of the present invention,
Equipped with a seedling planting device at the rear of the fuselage frame,
A wheel is arranged at a position on the front side of the body from the seedling planting device in the body frame,
The power from the engine is transmitted to the wheel and the seedling planting device through a mission case,
The mission case is arranged so as to be located on the front side of the aircraft from the front side end of the vehicle.

  According to this characteristic configuration, the axle is not compared with the case where the mission case, which is a heavy object, is deployed in a state where the mission case is partially or wholly inserted into a region on the rear side of the front end of the vehicle body. The front-rear balance of the center aircraft is closer to the front. Thereby, due to the increase in the number of lines, the front-rear balance of the airframe becomes rearward, and it is possible to suppress the heavy labor of work due to the heavy handle operation from the rear.

  By the way, as a way to improve the rearward balance of the front and rear of the aircraft, it may be possible to equip the front side of the aircraft with an additional balance weight, but in this case, the additional cost of the balance weight increases the cost and weight of the aircraft Will be invited.

  Therefore, in the walk-type rice transplanter, the mission case which is a heavy object is rationally arranged as described above, so that the increase in the cost due to the additional equipment of the balance weight and the increase in the weight of the aircraft can be achieved. While suppressing the heavy labor of the work caused by this, it is possible to improve the work efficiency by increasing the number of lines.

In the invention according to claim 2 of the present invention, in the invention according to claim 1,
A connecting member for connecting the wheel to the airframe so that vertical displacement with respect to the airframe is possible;
An actuator for driving the wheel to move in a vertical direction with respect to the body frame;
With
The actuator is arranged so as to be positioned on the front side of the body from the front side end of the wheel.

  According to this characteristic configuration, an actuator that is a heavy object is centered on the axle as compared with the case where the actuator is installed in a state where the actuator is partially or wholly inserted into a region on the rear side of the front end of the vehicle body. The balance of the front and rear of the aircraft that was said to be closer to the front. Thereby, the heavy labor of the work resulting from multiple stripes can be controlled more effectively.

  Therefore, in the walking type rice transplanter, by arranging the actuators that are heavy objects as described above, it is possible to increase the number of lines without increasing the cost and increasing the weight of the aircraft by adding the balance weight. The work efficiency can be improved by increasing the number of strips while effectively suppressing the heavy labor caused by the work.

In the invention according to claim 3 of the present invention, in the invention according to claim 1 or 2,
Equipped with a hydraulic cylinder as the actuator,
The control valve for controlling the flow of the hydraulic oil with respect to the hydraulic cylinder is disposed so as to be located on the front side of the vehicle body from the front side end portion of the wheel.

  According to this characteristic configuration, the control shaft, which is a heavy object, is disposed in a state where the control valve is partially or wholly inserted into a region on the rear side of the front side end of the wheel of the vehicle body. The front-rear balance of the center aircraft is closer to the front. Thereby, the heavy labor of the work resulting from multiple stripes can be controlled more effectively.

  Therefore, in the walk-type rice transplanter, the control valve, which is a heavy object, is rationally arranged as described above, so that it is possible to increase the number of lines without increasing the cost and increasing the weight of the aircraft due to the additional equipment of the balance weight. It is possible to improve work efficiency by increasing the number of strips while effectively suppressing the heavy labor caused by the work.

In the invention according to claim 4 of the present invention, in the invention according to any one of claims 1 to 3,
The engine is arranged so as to overlap the actuator in plan view.

  According to this characteristic configuration, the front-rear balance of the airframe centering on the axle is closer to the front than when the heavy engine is disposed on the rear side of the airframe relative to the actuator. Thereby, the heavy labor of the work resulting from multiple stripes can be controlled more effectively.

  Therefore, in the walk-type rice transplanter, by arranging the heavy engine as described above rationally, it is possible to increase the number of lines without increasing the cost and increasing the weight of the aircraft due to the additional equipment of the balance weight. The work efficiency can be improved by increasing the number of strips while effectively suppressing the heavy labor caused by the work.

In the invention according to claim 5 of the present invention, in the invention according to any one of claims 1 to 4,
The engine is arranged so as to be located on the front side of the vehicle body from the front side end portion of the vehicle body.

  According to this characteristic configuration, an axle that is a heavy object is centered compared to a case where a heavy engine is deployed in a state in which the engine is partially or wholly inserted into a region on the rear side of the front end of the vehicle body. The balance of the front and rear of the aircraft that was said to be closer to the front. Thereby, the heavy labor of the work resulting from multiple stripes can be controlled more effectively.

  Therefore, in the walk-type rice transplanter, by arranging the heavy engine as described above rationally, it is possible to increase the number of lines without increasing the cost and increasing the weight of the aircraft due to the additional equipment of the balance weight. The work efficiency can be improved by increasing the number of strips while effectively suppressing the heavy labor caused by the work.

In the invention according to claim 6 of the present invention, in the invention according to any one of claims 1 to 5,
The engine frame for supporting the engine in the airframe is disposed so as to be positioned on the front side of the airframe from the front side edge of the wheel.

  According to this characteristic configuration, the engine frame, which is a heavy load, is compared with the case where the engine frame is deployed in a state where the engine frame is partially or wholly inserted into the region on the rear side of the front end of the vehicle body. The front-rear balance of the center aircraft is closer to the front. Thereby, the heavy labor of the work resulting from multiple stripes can be controlled more effectively.

  Therefore, in the walk-type rice transplanter, the engine frame, which is a heavy object, is rationally arranged as described above, so that it is possible to increase the number of lines without increasing the cost and increasing the weight of the aircraft due to the additional equipment of the balance weight. It is possible to improve work efficiency by increasing the number of strips while effectively suppressing the heavy labor caused by the work.

In the invention according to claim 7 of the present invention, in the invention according to any one of claims 1 to 6,
The fuel tank is arranged so as to be located on the front side of the vehicle body from the front side end portion of the vehicle body.

  According to this characteristic configuration, fuel tanks that are heavy due to fuel being stored at the time of seedling planting work are partially or wholly inserted into a region on the rear side of the front end of the front side of the wheel in the body. Compared with the case where it is deployed in a state, the front-rear balance of the aircraft centering on the axle is closer to the front. Thereby, the heavy labor of the work resulting from multiple stripes can be controlled more effectively.

  Therefore, in the walk-type rice transplanter, by arranging the fuel tanks, which are heavy, as described above rationally, without increasing the cost and increasing the weight of the aircraft due to the additional equipment of the balance weight, it is possible to increase the number of the fuel tanks. It is possible to improve work efficiency by increasing the number of strips while effectively suppressing the heavy labor caused by the work.

  Hereinafter, a walking type rice transplanter according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an overall side view of a walking type rice transplanter for six-row planting, and FIG. 2 shows a schematic plan view thereof. As shown in these drawings, this walking type rice transplanter has a recoil starter type air-cooled engine 1 mounted on the front part of a body frame 2 and a pair of left and right wheels 3 driven by driving power from the engine 1. Are arranged on the left and right sides of the body frame 2, and the seedling planting device 4 for six-row planting driven by the working power from the engine 1 is positioned on the rear side of the body with respect to the left and right wheels 3. It is equipped with the control part 5 in the back of the seedling planting apparatus 4 with the rear part.

  That is, this walking type rice transplanter is equipped with the seedling planting device 4 for six-row planting with a large number of work strips, so that the efficiency of seedling planting work is improved.

  The engine 1 is configured in a low-bulk type in which a cylinder head (not shown) is mounted in a forward tilt posture. Further, the posture is set so that the output shaft 6 protrudes leftward and rightward.

  As shown in FIGS. 1 to 5, the fuselage frame 2 includes an engine frame 7 on which the engine 1 is mounted, a transmission case 8 in which the engine frame 7 is bolted to the front, and a rear end portion of the transmission case 8 facing rearward. A main frame 9 extended to the rear, a power distribution case 10 bolted to the rear end of the main frame 9, and left and right connection frames 11 extending from the left and right sides of the power distribution case 10 to the left and right outwards. The left and right planting transmission cases 12 are bolted to the extended ends of the corresponding connecting frames 11, the handle frames 13 are extended from the power distribution case 10 toward the rear upper side, and the like. .

  The left and right wheels 3 are connected to the body frame 2 via the corresponding left and right swing arms (connection members) 14 so as to be vertically displaced with respect to the body frame 2.

  As shown in FIGS. 1 and 2, the seedling planting device 4 is provided with a seedling mounting table 15 formed so that six mat-shaped seedlings can be placed. The seedling stage 15 is moved at a constant stroke in the left-right direction together with the mat-like seedlings placed by the operation of a lateral feed mechanism (not shown) built in the power distribution case 10 to which the working power from the engine 1 is transmitted. Move back and forth. Each mat-like seedling of the seedling mount 15 is operated by operation of a crank arm type planting mechanism 16 disposed on each of the left and right lower portions of the power distribution case 10 and the left and right lower portions of each of the left and right planting transmission cases 12. A predetermined amount of seedlings are sequentially cut from the lower end portions thereof at a constant pitch, and planted in a field mud portion prepared by three leveling floats 17 arranged side by side. Each mat-like seedling is moved relative to the seedling stage 15 by the operation of the corresponding vertical feed mechanism 18 provided on the back of the seedling stage 15 every time the seedling stage 15 reaches the left and right stroke ends. Are fed vertically downward at a predetermined pitch. The lateral feed mechanism, each planting mechanism 16, and the vertical feed mechanism 18 are operated by working power from the engine 1 that is distributed and transmitted via a power distribution mechanism (not shown) built in the power distribution case 10. .

  The control unit 5 is equipped with a control handle 19 formed in a U shape in plan view. The steering handle 19 is connected to the upper end of the handle frame 13 in such a posture that both left and right ends thereof extend toward the rear of the aircraft.

  As shown in FIGS. 3 to 6, an input shaft 20 that protrudes rightward and leftward in the left-right direction is disposed on the upper portion of the mission case 8. A belt-type transmission 21 that transmits the power from the engine 1 to the input shaft 20 of the transmission case 8 is installed over the input shaft 20 and the output shaft 6 of the engine 1.

  Although not shown in the figure, inside the transmission case 8 is a main clutch that intermittently transmits power from the input shaft 20 to the lower side in the transmission direction, and power that is transmitted through the main clutch is divided into driving power and working power. Distributing device, traveling transmission for shifting traveling power from the power distributing device, inter-company transmission for shifting working power from the power distributing device, and transmission from the traveling transmission to corresponding left and right wheels 3 A pair of left and right side clutches are provided.

  A cylindrical transmission case 8 </ b> A that bulges laterally outward is integrally formed at the left and right lower portions of the mission case 8. Each of the left and right transmission cases 8A is provided with a traveling output shaft 22 that enables the traveling power transmitted through the corresponding side clutch to be taken out.

  A connecting portion 8B for connecting the main frame is integrally formed at the rear upper part of the mission case 8. A work output shaft (not shown) that allows the work power to be taken out from the inter-transmission transmission is inserted in the center of the connecting portion 8B.

  The main frame 9 is made of a square pipe material made of steel pipe so as to have a function as a transmission case. A flange 9A that is bolted from the rear to the connecting portion 8B of the mission case 8 and a left and right that are bolted from the left and right lateral outer sides to the connecting portion 8B of the mission case 8 at the front end of the main frame 9 A pair of brackets 9B are welded.

  As a result, the main frame 9 that is bolted to the mission case 8 in a cantilevered manner is more firmly connected to the transmission case 8 than when the main frame 9 is provided with only the flange 9A and connected to the transmission case 8. can do.

  As shown in FIGS. 1 and 3 to 6, a preliminary seedling stand 23 is disposed above the main frame 9. The preliminary seedling stand 23 is supported by a preliminary seedling frame 24 erected on the machine body frame 2. The preliminary seedling frame 24 has a single connecting portion 24A provided at the front lower end thereof, as well as the left and right brackets 9B of the main frame 9, and is connected to the connecting portion 8B of the mission case 8 by bolts. A pair of connecting portions (not shown) are bolted to the upper left and right sides of the power distribution case 10.

  As shown in FIGS. 6 and 7, the driving power taken out from the left and right output shafts 22 of the mission case 8 is transmitted to the left and right wheels via shaft-type power transmission devices 25 and the like installed in the corresponding swing arms 14. 3 is transmitted.

  Each transmission device 25 includes a small-diameter first bevel gear 26 that is spline-fitted to the extending end of the corresponding traveling output shaft 22, a large-diameter second bevel gear 27 that meshes with the first bevel gear 26, and a second bevel gear 27. Are coupled to the first transmission shaft 28 via a spline joint 29 and a small-diameter first shaft integrally formed at one end of the second transmission shaft 30. A large-diameter fourth bevel gear 31 that meshes with the three bevel gears 30A, an axle 32 on which the fourth bevel gear 31 is spline-fitted, and the like are configured. In other words, each transmission device 25 uses the traveling power from the transmission case 8 as a first reduction part 33 having a small reduction ratio composed of the first bevel gear 26 and the second bevel gear 27, the third bevel gear 30A, and the fourth bevel gear 31. Is transmitted to the wheel 3 connected to the axle 32 through a second reduction portion 34 having a large reduction ratio.

  Although illustration is omitted, the working power extracted from the working output shaft of the transmission case 8 is transmitted to the input shaft of the power distribution case 10 via the transmission shaft built in the main frame 9, and from the input shaft, Via a torque limiter or a working clutch built in the power distribution case 10, it is transmitted to the relay shaft serving as a planting drive shaft disposed in the left and right direction at the lower part of the power distribution case 10, and both right and left ends of the relay shaft While being transmitted to the horizontal feed mechanism, the vertical feed mechanism 18 and the like via a chain-type power distribution mechanism and from the distribution shaft of the power distribution mechanism to the left and right connection frames. 11 is transmitted to the planting drive shaft disposed in the left-right direction at the lower part of each planting transmission case 12 through the transmission shaft built in the left and right planting transmission cases 12. From each planting drive shaft is transmitted to the planting mechanism 16 connected to their left and right ends. Each of the left and right connection frames 11 is made of a steel pipe round pipe material or the like so as to have a function as a transmission case.

  As shown in FIGS. 1 to 8, the left and right swing arms 14, together with the internal transmission device 25, have a horizontal axis X <b> 1 that is the center of each transmission case 8 </ b> A of the mission case 8 and the left and right traveling output shafts 22. Oscillating displacement in the vertical direction with fulcrum as the fulcrum is allowed. In addition, a belt-like plate spring 35 is installed over the left and right swing arms 14 to suppress their relative swinging in the vertical direction.

  On the swing fulcrum side of each swing arm 14, there is a linkage member 37 that enables operation linkage between the left and right swing arms 14 and a single lifting cylinder (an example of an actuator) 36 that swings and drives the swing arm 14. It is connected. Each linkage member 37 includes a pair of upper and lower balance arms 38 that are pin-coupled to the piston rod 36 </ b> A of the lifting / lowering cylinder 36 at the protruding end of the piston rod 36 </ b> A so as to be able to swing the balance, and corresponding linkage members 37 from both ends of the balance arm 38. The operation is linked through left and right linkage arms 39.

  The elevating cylinder 36 is disposed directly below the engine 1 in a rearward raising posture toward the linkage member 37 from a position lower than the lower surface of the mission case 8. As the lifting cylinder 36, a single-acting hydraulic cylinder having a large cylinder diameter that operates even at a low pressure is employed. The flow of hydraulic oil to the elevating cylinder 36 is controlled by a control valve 40 placed on the mission case 8. The control valve 40 is operatively linked to an elevating lever 41 provided in the control unit 5.

  From this configuration, when the lift lever 41 is manually operated, the control valve 40 is operated in accordance with the operation, the lift cylinder 36 is expanded and contracted, and the left and right swing arms 14 swing integrally with the body frame 2 in the vertical direction. The left and right wheels 3 are integrally displaced in the vertical direction with respect to the body frame 2. In other words, the left and right axles 32 are used as fulcrums across the working position where each leveling float 17 contacts the field mud surface and the non-working position where each leveling float 17 separates from the field mud surface by human operation of the lifting lever 41. The aircraft can be moved up and down relative to the field mud surface.

  Further, when the ground reaction force against one of the left and right wheels 3 increases due to the inclination or undulation of the field cultivator, the left and right wheels 3 act by the leaf spring 35 due to the increased ground reaction force. Accordingly, the posture of the airframe in the left-right direction is maintained in a horizontal posture or a substantially horizontal posture. On the other hand, when the ground reaction force with respect to either the left or right wheel 3 is reduced, the left and right wheels 3 are relatively displaced by the action of the leaf spring 35, so that the attitude of the airframe in the left-right direction is horizontal or substantially Maintained in a horizontal position. That is, the left and right swing arms 14, leaf springs 35, left and right linking members 37, a pair of upper and lower balance arms 38, and left and right linking arms 39, etc., change the horizontal posture of the aircraft to a horizontal posture or a substantially horizontal posture. A maintaining rolling mechanism 42 is configured.

  By adopting a hydraulic cylinder having a large cylinder diameter as the lifting / lowering cylinder 36, the entire length of the lifting / lowering cylinder 36 can be shortened, and accordingly, the length of the linkage member 37 extending from each swing arm 14 is lengthened. As a result, the driving force required to swing the left and right swing arms 14 up and down can be reduced.

  As shown in FIGS. 5, 9, and 10, the rocking range of the upper and lower balance arms 38 is limited between the piston rod 36 </ b> A and the upper and lower balance arms 38, thereby rolling more than the allowable range of the machine body. A regulating mechanism 43 that regulates the above is interposed.

  The restricting mechanism 43 includes a fixed arm 44 that extends from the protruding end of the piston rod 36 </ b> A so as not to swing relatively, a pair of upper and lower swing links 45 that are pin-coupled to the extended end of the fixed arm 44, and The upper and lower balance arms 38 are connected so as to be swingable integrally, and are connected to the long hole 45A formed in the free end of the upper and lower swing links 45 by a linkage pin 46, etc. It is configured to allow the aircraft to roll.

  As shown in FIGS. 3 and 4, the control valve 40 is operated and linked to the front end of the leveling float 17 located at the center of the left and right via an operating arm 47 and a linkage rod 48.

  Due to this linkage structure, when the leveling float 17 at the center of the left and right rises and swings around the rear fulcrum from the preset reference posture, the control valve 40 moves up with respect to the field mud surface in conjunction with the swing. (The left and right swing arms 14 are lowered and swung with respect to the machine body frame 2). On the contrary, when the leveling float 17 at the center of the left and right is lowered and swung around the rear fulcrum from the reference posture, the body is lowered with respect to the field mud surface in conjunction with the rocking (the left and right swing with respect to the body frame 2). The arm 14 is swung up and down). Then, when the leveling float 17 at the center of the left and right returns to the reference posture by the switching operation, the aircraft is raised and stopped with respect to the field mud surface along with the return (the left and right swing arms 14 are moved with respect to the aircraft frame 2). Switch to neutral state.

  That is, with this linkage structure, the height position of the aircraft relative to the field mud surface can be maintained at a predetermined height position where the leveling float 17 is in the reference posture regardless of the ups and downs of the field cultivator, etc. The seedling planting by each planting mechanism 16 can be stably performed at a preset planting depth.

  As shown in FIGS. 9 and 10, each of the left and right linkage arms 39 is provided with a buffer mechanism 49 that absorbs an impact generated when the left and right swing arms 14 are swung up and down rapidly.

  Each buffer mechanism 49 has a long hole 39A formed at one end of the linkage arm 39, a receiver 39B welded to one end of the linkage arm 39, and a relative swing of the linkage arm 39 to the upper and lower balance arms 38 via the long hole 39A. The connecting pin 50 movably connected, the receiving member 39B and the connecting pin 50 are slidably supported with respect to the linkage arm 39, and are interposed between the receiving member 39B and the sliding member 51. The elastic rubber 52 and the nut 53 that prevents the sliding member 51 from coming off from the receiving member 39B by screwing with one end of the sliding member 51, and the like. The reference compression state of the elastic rubber 52 can be set and changed by adjusting the screwing of the nut 53 to the sliding member 51.

  As shown in FIGS. 3 to 8, the left and right swing arms 14 are supported by the transmission case 8 </ b> A so as to be capable of relative rotation about a horizontal axis X <b> 1. The arm portion 14B extends in a direction orthogonal to the axis X1 and the wheel mounting portion 14C located at the extending end of the arm portion 14B.

  The rotating portion 14A is integrally formed with a boss 54A that is externally fitted to the fitted portion 8a formed at the extending end of the transmission case 8A, a flange 54B to which the arm portion 14B is bolted, and the like. The joint member 54 is configured.

  The arm portion 14B includes a round pipe 55 made of steel pipe in which a flange 55A connected to the rotating portion 14A by a bolt is welded to one end and a flange 55B connected to the mounting portion 14C by a bolt is welded to the other end. ing.

  The mounting portion 14C is configured by connecting a first member 56 integrally formed with a flange 56A that is bolted to the arm portion 14B and a second member 57 that is bolted to the first member 56.

  The fitted portion 8a of the transmission case 8A is thick so that the boss 54A of the joint member 54 is externally fitted and supported so as to be relatively rotatable while the traveling output shaft 22 is supported so as to be relatively rotatable. The large one is formed (see FIG. 7).

  The joint member 54 has a boss 54C facing the boss 54A supported by the travel output shaft 22 via a ball bearing 58 so as to be relatively rotatable, and a nut 59 screwed to the end of the travel output shaft 22. Therefore, it is supported by a ball bearing 58 (see FIG. 7).

  In other words, the transmission case 8A of the transmission case 8 and the traveling output shaft 22 are configured to support the swing arm 14 so as to be swingable up and down around the axis X1 in the left-right direction. Thereby, each swing arm 14 can be supported with high support strength by the corresponding transmission case 8A and the output shaft 22 for traveling.

  As shown in FIGS. 3 to 10, each of the left and right linking members 37 is configured by a sheet metal member 62 having a substantially triangular shape in a side view in which a boss 62 </ b> A connected to the linking arm 39 via a connecting pin 61 is welded. .

  Each of the left and right linkage arms 39 is formed with a plurality of connection holes 39C that allow the connection positions of the corresponding linkage members 37 to be changed (see FIGS. 9 and 10).

  Each sheet metal member 62 has a reinforcing rib 62B bent at each edge except for the bottom edge so as to have high strength. Then, the connecting member connecting flange formed such that the length of the bottom edge portion 62C connected to the swing arm 14 is perpendicular to the left-right axis X1 on the boss 54A of the joint member 54 (rotating portion 14A). 54D and the length of the round pipe 55 (arm portion 14B) are formed to have a length extending to the connecting member connecting bracket 55C welded to one end side of the machine body. Then, a pair of first connection holes 62D are formed on the front end side of the bottom edge portion 62C to enable bolt connection in the lateral direction from the inboard side of the sheet metal member 62 to the flange 54D of the joint member 54. A pair of second connection holes 62E are formed on the rear end side of the bottom edge portion 62C to enable the bolt connection in the lateral direction from the inboard side of the sheet metal member 62 to the bracket 55C of the round pipe 55. .

  That is, each of the left and right linking members 37 has a bottom edge portion 62C having a length extending between the rotating portion 14A and the arm portion 14B of the corresponding swing arm 14, and is thus coupled to the swing arm. 14 functions as a reinforcing member for reinforcing the swing fulcrum side. Thereby, the strength on the swing fulcrum side of the swing arm 14 can be improved without providing an improvement such as newly providing a reinforcing rib on the rotating portion 14A of the swing arm 14 or the like.

  Further, since the moment acting on the swing arm 14 is distributed to the rotating portion 14A and the arm portion 14B via the linkage member 37, for example, when the moment is configured to concentrate on the rotating portion 14A. As compared with the above, even if a rotating portion having a low strength is adopted as the rotating portion 14A, the durability of the swing arm 14 can be improved.

  As shown in FIGS. 3, 7, and 8, the joint member 54 is formed in series so that the flange 54 </ b> B for connecting the arm portion and the flange 54 </ b> D for connecting the linking member are connected in a substantially L shape. . As a result, the flanges 54B and 54D can be separated without complicating the shape by newly providing reinforcing ribs on the joint member 54 or increasing the thickness of the joint member 54 by increasing the wall thickness. Compared with the case where it forms, the intensity | strength of the joint member 54 (rotating part 14A) can be improved.

  As shown in FIGS. 5 to 8, in the joint member 54, the boss 54 </ b> A that is externally fitted to the fitted portion 8 a of the transmission case 8 </ b> A has its left-right orientation so that the fitting area with respect to the fitted portion 8 a is increased. The length in the direction along the axis X1 is formed to be a long one extending further outward (toward the inside of the machine body) from the connecting member connecting flange 54D.

  On the other hand, the fitted portion 8a of the transmission case 8A has a length in the direction along the left and right axis X1 so that a support area for the joint member 54 is large, and a flange forming portion of the boss 54A in the joint member 54 It is formed into a long one extending from the end to the end.

  Between the fitted portion 8a of the transmission case 8A and the boss 54A of the joint member 54, there is a bush 63 made of a synthetic resin sliding bearing formed in a cylindrical shape having substantially the same length as that. (See FIG. 7).

  That is, the bushing 63 in which the fitted portion 8a of the transmission case 8A and the boss 54A of the joint member 54 formed so that the length in the direction along the left-right axis X1 is substantially the same as those lengths. It is fitted so that relative rotation is possible. Thereby, the fitting area between the to-be-fitted part 8a of the transmission case 8A and the boss 54A of the joint member 54 is increased, and a stable support state in which rattling between them is effectively suppressed is achieved. While being obtained, adhesion between the fitted portion 8a of the transmission case 8A and the boss 54A of the joint member 54 can be effectively suppressed.

  That is, the swing arm 14 corresponding to the left and right transmission cases 8A can be supported in a more stable state, and the swinging of the swing arm 14 about the left and right axis X1 can be performed more smoothly. As a result, it is possible to smoothly perform the raising / lowering operation for integrally swinging the left and right swing arms 14 and the rolling operation for relatively swinging the left and right swing arms 14 up and down.

  As shown in FIGS. 4 to 8, the left and right ends of the leaf spring 35 are mounted on the bracket 55 </ b> C of the round pipe 55 (arm portion 14 </ b> B) with the linkage member 37 interposed between the bracket 55 </ b> C and the inside of the body. A connecting portion 35 </ b> A that is connected in a lateral direction from the side is bent.

  That is, the linkage member 37 and the leaf spring 35 are configured to be coupled to the bracket 55C of the round pipe 55 (arm portion 14B) by the pair of bolts 64. Thereby, for example, the simplification of the configuration can be achieved as compared with the case where the linkage member 37 and the leaf spring 35 are individually connected to the round pipe 55 (arm portion 14B).

  In addition, since the plate spring 35 is configured to be bolt-connected to the left and right swing arms 14 from the lateral direction, the plate spring 35 can be connected by the interchange of the connection holes 35B formed in each connection portion 35A of the plate spring 35. The right and left flat surface portions 35C can be easily connected to the left and right swing arms 14 in an appropriate connection posture along the center of the arm portion 14B of the corresponding swing arm 14 in parallel.

  Further, compared to the case where the leaf spring 35 is bolt-connected to the left and right swing arms 14 from the vertical direction, the torsional force and bending force acting on the bolts 64 when the left and right swing arms 14 swing relative to each other are greatly increased. Can be reduced. Thereby, the durability of the bolt 64 is improved, and the reliability of the connecting portion between the left and right swing arms 14 and the leaf spring 35 is improved.

  As shown in FIGS. 3, 5, 6, and 8, in the swing arm 14, the rotating portion 14 </ b> A and the attaching portion 14 </ b> C are formed in a symmetrical shape that can be used both on the left and right.

  As shown in FIGS. 1, 2, and 5, each of the left and right swing arms 14 includes a rotating portion 14A and a fitted portion 8a that supports the rotating portion 14A so as to be relatively rotatable. The shaft center X1 of the transmission case 8 and the flange 9A, 9B of the main frame 9 connected to the connection part 8B of the transmission case 8 are positioned on the front side of the vehicle body from the front side end portion 3a of the wheel 3. To the center X2 of the axle 32 is set to be longer than the radius r of the wheel 3.

  As a result, in this walking type rice transplanter, the rotating portion 14A of the swing arm 14, the transmission case 8, the main clutch provided in the transmission case 8, the power distribution device, the travel transmission device, the stock transmission device, the pair of left and right The side clutch, the flanges 9A and 9B of the main frame 9 connected to the transmission case 8, the control valve 40 mounted on the transmission case 8, the engine frame 7 connected to the front of the transmission case 8, and the engine frame 7 The engine 1 and the transmission case 8 together with the engine 1, the belt-type transmission 21 installed over the output shaft 6 of the engine 1 and the input shaft 20 of the transmission case 8, and the elevating cylinder 36 disposed immediately below the engine 1. A heavy object such as a fuel tank 65, which is arranged so as to be located above the vehicle, It will be positioned on the body front side of the third fuselage front end 3a.

  In other words, in this walking type rice transplanter, in order to increase the efficiency of seedling planting work, the machine body is equipped with a seedling planting device 4 for six-row planting with a large number of work strips and a large weight at the rear of the body. Considering the fact that the weight on the rear side becomes heavier and the front-rear balance of the airframe centering on the axle 32 becomes rearward, as described above, the heavy object such as the transmission case 8 is connected to the front end 3a of the airframe 3 of the wheel 3. It is arranged so as to be located on the front side of the aircraft, so that the rear side of the aircraft on which the seedling planting device 4 weighted by the multiple strips is deployed and the heavy items such as the mission case 8 are deployed. It is possible to properly balance the front side of the machined body with the axle 32 as the center.

  As a result, while increasing the efficiency of seedling planting work by increasing the number of lines, the increase in the total weight due to the additional equipment of the balance weight does not lead to an increase in the overall weight, etc. It is possible to prevent the work from becoming heavy due to the heavy steering operation from the rear due to the rear balance of the aircraft.

  As shown in FIG. 1, each of the left and right planting transmission cases 12 is equipped with a bracket 66 extending rearward. The left and right brackets 66 support a float fulcrum pipe 67 that is horizontally mounted over the extending end portions thereof so as to be relatively rotatable. The float fulcrum pipe 67 is integrally provided with three support arms 68 and a single operation lever 69 that are spaced apart from each other in the left-right direction. And the corresponding leveling float 17 is connected with the lower end part of those support arms 68 so that an up-down swing is possible. The operation lever 69 is operated and guided by a lever guide 70 provided on the handle frame 13 and is engaged at an arbitrary operation position by selective engagement with a plurality of engaged portions (not shown) formed on the lever guide 70. Held together.

  From this configuration, by selecting the engagement position of the operation lever 69 with respect to the lever guide 70, the height position of each leveling float 17 with respect to the body frame 2, that is, the lower left and right sides of the power distribution case 10 and the right and left planting It is possible to change the height position of each leveling float 17 with respect to the planting mechanism 16 arranged on each of the left and right lower portions of the transmission case 12, thereby adjusting the seedling planting depth by each planting mechanism 16. be able to.

  As shown in FIG. 1, a pair of left and right drawing markers 71 are provided at the rear of the body frame 2. Each of the left and right drawing markers 71 has an action posture in which the front end portion 71A lies down on the left and right sides of the airframe so that the front end portion 71A enters the field mud surface, and the airframe so that the front end portion 71A is close to the steering handle 19. It is configured such that the posture can be switched to the retracted posture that is erected inward. The posture switching structure will be described below with reference to the drawings.

  As shown in FIGS. 1 and 11 to 14, the handle frame 13 is equipped with a left and right support frame 72 that supports the seedling stage 15 so as to be able to reciprocate in the left and right directions. ing. A first reinforcing frame 73 is installed across the left and right ends of the support frame 72 and the left and right brackets 66 corresponding to the ends. A support plate 75 having a fulcrum pin 74 facing forward and backward is welded to the lower end portion of each first reinforcing frame 73. Each fulcrum pin 74 is fitted with a base end portion 71B of the corresponding drawing marker 71 so as to be relatively rotatable, and is in contact with the base end portion 71B so that the swing range of the corresponding drawing marker 71 is set. A swing limiting member 76 that limits the range between the action posture and the retracted posture is fitted. A tension spring 77 is installed over the left and right corresponding support plates 74 and the base end portion 71 </ b> B side of the drawing marker 75. Each tension spring 77 swings up and down over the fulcrum pin 74 in accordance with the swing operation of the corresponding drawing marker 71. Each of the left and right swing restricting members 76 is made of a steel plate material bent in a U-shape in plan view, and in the state of being externally fitted to the corresponding fulcrum pin 74, the back surface is in contact with the support frame 72. The rotation with the fulcrum pin 74 as a fulcrum is prevented.

  On the other hand, a pair of left and right operation levers 78 are connected to the support frame 72 via corresponding front and rear support shafts 79 so as to be able to swing in the left and right directions using the support shafts 79 as fulcrums. ing. Each operation lever 78 is linked to its left / right swinging operation so that the corresponding drawing marker 71 swings and displaces in the same direction via the linkage rod 80. It is linked to 71B. Each linking rod 80 has one end portion of the corresponding tension spring 77 locked to the end portion on the side linked to the base end portion 71 </ b> B of the drawing marker 71.

  From this configuration, before starting the seedling planting work in the current process, if the left or right operation lever 78 located on the side of the seedling planting work path in the next process is swung toward the left or right outward of the aircraft, In conjunction with the operation, either the left or right drawing marker 71 located on the side of the seedling planting work path in the next process is switched from the retracted posture to the acting posture, and held in the acting posture by the action of the tension spring 77. Thereby, the driving | running | working reference line in the seedling planting operation | work of the next process can be formed in a field mud surface with the start of the seedling planting operation | work in the present process. When the seedling planting operation in the current process is completed, if the left or right operation lever 78 located on the side of the seedling planting work path in the next process is swung toward the left or right inward of the aircraft, the operation is linked. Then, the left or right drawing marker 71 positioned on the side of the seedling planting work path in the next process is switched from the acting posture to the retracted posture, and is held in the retracted posture by the action of the tension spring 77. Thereby, the left and right drawing markers 71 can be retracted to the machine body side during turning traveling to shift from the seedling planting work path of the current process to the seedling planting work path of the next process.

  As shown in FIGS. 11 to 14, each swing limiting member 76 has a pair of front and rear first through holes 76 </ b> A and second through holes 76 </ b> B. In each swing limiting member 76, the first through hole 76 </ b> A is drilled by the locking pin 81 when the locking pin 81 is inserted while the corresponding drawing marker 71 is switched to the retracted position. , The position of the corresponding drawing marker 71 is set to a position that prevents the swinging displacement from the retracted posture. The drilling position of the second through hole 76B is set to a position where the swinging displacement of the corresponding drawing marker 71 is not restricted by the locking pin 81 when the locking pin 81 is inserted.

  That is, during traveling, for example, the left and right drawing markers 71 are switched to the retracted posture, and then the respective locking pins 81 are inserted into the first through holes 76A of the corresponding swing restriction members 76, and the beta pins 82 are used. If it is prevented from coming off, it is possible to reliably prevent each drawing marker 71 from unexpectedly switching from the retracted position to the working position due to a large shaking of the airframe in the left-right direction during traveling. Further, during work travel, if each locking pin 81 is inserted into the second through hole 76B of the corresponding rocking restriction member 76 and is prevented from being removed by the beta pin 82, the locking pin 81 is moved during work travel. The possibility of losing can be reliably avoided.

  As shown in FIGS. 1 and 11 to 14, the left and right first reinforcing members 73 are detachably bolted to the left and right end portions of the support frame 72 and the left and right brackets 66. Thereby, in this walking type rice transplanter, each 1st reinforcement member 73 on either side is comprised so that replacement | exchange with the 2nd reinforcement member 83 shown in FIG. 15 can be performed easily. As shown in FIG. 15, the left and right second reinforcing members 83 have the same shape as the left and right first reinforcing members 73, and the support plate 75 is not welded to their lower ends. Although not shown, the left and right operation levers 78 are detachably secured to the support frame 72 by the beta pins (not shown) inserted through the support shafts 79 together with the corresponding support shafts 79. ing.

  From this configuration, the left and right operating levers 78 are removed, and the left and right first reinforcing members 73 are replaced with the second reinforcing members 83, whereby this walking type rice transplanter has a marker including a pair of left and right drawing markers 71. The specification can be easily changed from the specification (see FIGS. 1 and 11 to 14) to the markerless specification (see FIG. 15) that does not include the pair of left and right drawing markers 71. Further, in the markerless specification, it is possible to avoid an unnecessary increase in cost and an increase in weight due to the fact that the member for attaching the drawing marker remains.

    [Another embodiment]

[1] The present invention is not limited to a walk-type rice transplanter for six-row planting, and a walk-type rice transplanter other than for six-row planting can be used as long as it is a multi-row walk-type rice transplanter. Can also be applied.

[2] The number of heavy objects placed on the front side of the vehicle body from the front side end portion 3a of the wheel 3, the distance from the front side end portion 3a of the wheel 3 and the like, Except for being arranged at a position on the front side of the machine body from the portion 3a, there are various types according to the weight of the seedling planting device 4 depending on the number of work strips, the distance between the axle 32 of the wheel 3 and the seedling planting device 4, etc. Can be changed.

[3] As the actuator 36, a hydraulic motor, an electric motor, an electric cylinder, or the like may be adopted. Further, the left and right swing arms 14 may be provided with a dedicated actuator 36.

Overall side view of walking rice transplanter Schematic overall plan view of walking type rice transplanter Side view of the main part showing the operating structure of the swing arm A vertical side view of the main part showing the operating structure of the swing arm Plan view of the main part showing the operating structure of the swing arm Longitudinal rear view of the main part showing the configuration of the fuselage frame and swing arm Cross-sectional plan view of the main part showing the configuration of the swing arm The exploded perspective view of the principal part which shows the connection structure of a swing arm, a connection member, and a leaf | plate spring Cross-sectional plan view of the main part showing the linkage structure of the lifting cylinder and linkage member The exploded perspective view of the principal part which shows the linkage structure of a raising / lowering cylinder and a linkage member Outline vertical rear view of the main part showing the operation structure of the drawing marker Longitudinal rear view of main part showing support structure of drawing marker Side view of main part showing support structure of drawing marker Cross-sectional plan view of the main part showing the support structure of the drawing marker Schematic longitudinal rear view of the main part showing the state of the specification change to the markerless specification

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Airframe frame 3 Wheel 3a Aircraft front side edge part 4 Seedling planting device 7 Engine frame 8 Mission case 14 Connecting member 36 Actuator (hydraulic cylinder)
40 Control valve 65 Fuel tank

Claims (7)

Equipped with a seedling planting device at the rear of the fuselage frame,
A wheel is arranged at a position on the front side of the body from the seedling planting device in the body frame,
The power from the engine is transmitted to the wheel and the seedling planting device through a mission case,
A walking type rice transplanter, wherein the mission case is arranged to be located on the front side of the vehicle body from the front side end of the vehicle body. A connecting member for connecting the wheel to the airframe so that vertical displacement with respect to the airframe is possible;
An actuator for driving the wheel to move in a vertical direction with respect to the body frame;
With
The walking type rice transplanter according to claim 1, wherein the actuator is disposed so as to be located on the front side of the vehicle body from the front side of the vehicle body. Equipped with a hydraulic cylinder as the actuator,
3. The walking type according to claim 1, wherein a control valve for controlling the flow of hydraulic oil to the hydraulic cylinder is disposed so as to be located on the front side of the vehicle body from the front side end portion of the wheel. Rice transplanter.   The walking type rice transplanter according to any one of claims 1 to 3, wherein the engine is disposed so as to overlap the actuator in plan view.   The walking type rice transplanter according to any one of claims 1 to 4, wherein the engine is disposed so as to be located on the front side of the vehicle body from the front side end portion of the vehicle body.   The engine frame for supporting the engine in the body frame is disposed so as to be located on the front side of the body from the front side end portion of the wheel. Walking type rice transplanter.   The walking type rice transplanter according to any one of claims 1 to 6, wherein the fuel tank is disposed so as to be located on the front side of the vehicle body from the front side end portion of the wheel.

Images