JP2014054259A - Riding-type agricultural operation unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure high rigidity and durability even in a large-sized riding-type rice transplanter such as an 8-row transplanter.SOLUTION: In a riding type agricultural operation unit equipped with a traveling machine body (1) in which a chassis is supported by a lower structure, the lower structure is composed so as to connect a mission case (31) and a rear axle case (34) placed behind it by a lower connection body (36), and the chassis has right and left side frames (9) and (10) that extend in a front-back direction, and a rear frame (13) with a longer length from left side to right side that connects the right and left side frames (9) and (10) at the rear end. The rear frame (13) is supported by the rear axle case (34) through a rear pillar (14), and the right and left side frames (9) and (10) are supported by the lower connection body (36) through a reinforcement body (37).

Description

  The present invention relates to a riding type farm working machine such as a riding type rice transplanter.

  There is a riding type rice transplanter as an example of a riding type farm working machine. This riding type rice transplanter has a traveling machine body supported by front wheels and rear wheels, and a seedling planting device disposed behind the traveling machine body is connected to the traveling machine body so that the height can be adjusted. The traveling machine body has a seat and a steering handle and an engine mounted thereon, and traveling and seedling work are performed by power from the engine.

  A traveling machine body usually has a frame (chassis) made of steel such as a steel pipe or a channel material, and generally has left and right side frames that extend long in the front-rear direction as the main members of the frame. The left and right side frames are connected by a horizontally long member. A link device is connected to the seedling planting device and the traveling machine body so as to be relatively rotatable, and the traveling machine body and the link device are connected by a hydraulic cylinder. Accordingly, when the hydraulic cylinder is expanded and contracted, the seedling planting device moves up and down.

  An example of a specific structure of a traveling machine body in a riding type rice transplanter is disclosed in Patent Document 1 relating to the application of the present applicant. In Patent Document 1, the left and right side frames 44 are bent in a side view so that the height of the left and right side frames increases as the rear half thereof goes backward (that is, the latter half is formed as an inclined portion), and the left and right side frames 44 are arranged. The front ends of the left and right side frames 44 are connected to the upper side surface of the rear frame 43 rising from the rear axle case 38, and the left and right rear columns 43 are further connected. A laterally long rear frame is bent at the upper end of the frame.

  In Patent Document 1, the transmission case 6 extends to the rear axle case 38, and power is transmitted to the rear wheels by a built-in chain disposed in the rear half of the transmission case 6. Further, the middle portions of the left and right side frames 44 are connected by a mid frame 175 penetrating therethrough. A bracket 176 is fixed to the mid frame 175 and the transmission case 6, and a lifting cylinder is connected to the bracket 176. ing.

Japanese Patent No. 3804926

  In Patent Document 1, it can be said that the mission case and the rear axle case serve as structural members (strength members) that support other members, and thus can contribute to simplification of the structure of the traveling machine body and cost reduction.

  The invention of the present application is made for the purpose of further improving the rigidity of the traveling machine body in the case where the transmission case and the rear axle case are also used as the structural material of the traveling machine body as in Patent Document 1.

  The invention according to claim 1 is a riding type agricultural working machine including a traveling machine body (1) that supports a chassis with a lower structure, wherein the lower structure includes a transmission case (31) and a rear axle case ( 34) are connected by a lower connector (36), and the chassis has left and right side frames (9) and (10) extending in the front-rear direction, and the left and right side frames (9) and (10) at the rear end thereof. Left and right laterally long rear frames (13) connected to each other, and the rear frame (13) is supported by a rear axle case (34) via a rear column (14), and the left and right side frames (9) (10 ) Is supported by the lower connecting body (36) via the reinforcing body (37).

  According to a second aspect of the present invention, in the riding type agricultural work machine according to the first aspect, the left and right side frames (9) and (10) are in front of each other with a left and right horizontally long midframe (11) connecting front and rear middle portions thereof. A substantially horizontal posture front side frame (9) and a rear side frame (10) which is located behind the mid frame (11) and is inclined so as to increase backward. That's it.

  In the present invention, when the transmission case (31) and the rear axle case (34) are also used as the strength members of the traveling machine body (1), the side frames (9) and (10) are disposed below the reinforcement body (37). Since it is supported by the connecting body (36), the chassis and the lower structure are reinforced with each other, and as a result, the traveling machine body (1) can ensure a remarkably high rigidity. Therefore, high robustness can be ensured even with a large rice transplanter such as 8-row planting. Further, since high robustness can be secured, it is possible to easily perform heavy work by attaching a work machine other than planting to the traveling machine body (1).

  The reinforcing body (37) can be made of various materials such as plate material and mold steel, and its form can be developed in various ways. The reinforcing body (37) has a frame structure with a hollow steel pipe and is substantially U in front view. Since the reinforcing body (37) can be easily manufactured by bending a material such as a steel pipe if it is formed in the shape of a die, a substantially V shape or a substantially U shape, the cost advantage is high. Also, the loads acting on the left and right front wheels and the left and right rear wheels of the traveling machine body (1) are usually different depending on the road conditions, and due to such load unevenness, the traveling machine body (1) has different loads. The torsional force often acts, but if the reinforcing body (37) has a frame structure made of a hollow steel pipe and has a substantially U-shaped, substantially V-shaped or substantially U-shaped form in front view, the reinforcing body Since (37) has a left-right symmetric shape, the traveling machine body (1) can exhibit strong strength against torsion.

  According to the invention of claim 2, since the front end of the rear side frame (10) is supported by the reinforcing body (37) in the vicinity immediately below, the reinforcing function of the reinforcing body (37) is more accurately exhibited. Therefore, it is more suitable for increasing the strength.

  As mentioned above, in the riding type rice transplanter, the seedling planting device is moved up and down by rotating the link mechanism with the cylinder. However, naturally, a large load is applied to the cylinder. When the cylinder is connected to (36), a large bending load acts on the lower connecting body (36). However, in the present invention, since the chassis and the lower coupling body are coupled by the reinforcing body (37), the resistance of the lower coupling body (36) against the bending force can be remarkably improved. Even if it is attached, high strength can be secured.

  Further, the reinforcing body (37) is tilted forward in a side view so as to have a U-shaped or U-shaped upward opening in a front view and lower toward the rear, and at the bottom of the reinforcing body (37). If the fuel tank is supported, the fuel tank can be disposed so as to sink below the chassis, which has the advantage that the capacity of the fuel tank can be increased. Further, since the reinforcing body (37) is inclined forward in a side view, when the cylinder is provided in the lower coupling body (36) as described above, the reinforcing body (37) is against the bending force caused by the pulling of the cylinder. It will act to stretch. Therefore, the reinforcing body (37) is tilted forward in a side view so that it is U-shaped or U-shaped in an upward opening in a front view and becomes lower toward the rear, and at the bottom of the reinforcing body (37). Supporting the fuel tank is also suitable as a means for increasing the strength when a cylinder is attached.

It is a whole side view of a rice transplanter in the state where a body cover was attached. It is a whole top view of a rice transplanter in the state where a body cover was removed. It is a separated perspective view of a traveling machine body. It is a rough side view of a traveling body. It is a rough top view of a traveling body. It is a partially broken side view of a traveling machine body. (A) is an exploded perspective view of the main part, (B) is a perspective view showing a connected state between the lower connecting body and the transmission case, (C) is a perspective view showing a connected state between the lower connected body and the rear axle case. is there. (A) is the isolation | separation side view of the principal part, (B) is the perspective view seen from the bottom in order to show the attachment structure of a fuel tank. It is a top view in the state where the fuel tank was shifted to the side. It is a bottom view of the principal part. It is a partial side view of the principal part. (A) is the isolation | separation perspective view of the principal part in the state which turned over the fuel tank, (B) is the figure which looked at the principal part from diagonally back. It is a partially broken side view which shows the connection structure of a link apparatus. It is an isolation | separation perspective view which shows the connection structure of a link apparatus. It is a figure which shows a modification.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a riding type rice transplanter (hereinafter simply referred to as “rice transplanter”). In the following explanation, the words “front and rear” and “left and right” are used to specify the direction. Unless otherwise specified, these words are displayed with reference to the operator seated in the forward direction of the rice transplanter. doing. The front view direction is a direction viewed from a direction opposite to the forward direction.

(1). Outline of rice transplanter First, the outline of rice transplanter will be explained. As shown in FIGS. 1 to 2, the rice transplanter has a traveling machine body 1 and a seedling planting device 2 as basic elements, and the seedling planting device 2 can be raised and lowered to the rear of the traveling machine body 1 via a link device 3. It is connected to.

  The traveling machine body 1 is supported by left and right front wheels 4 and rear wheels 5, and the front wheels 4 and the rear wheels 5 are driven by power (note that the rear wheels 5 are provided with auxiliary wheels in a double system or a triple system). To do.) The traveling machine body 1 includes a seat 6 with a backrest on which a driver sits and a steering handle 7 disposed in front of the seat. The seat 6 and the steering handle 7 are disposed at the left and right intermediate positions of the traveling machine body 1. Preliminary seedling stands 8 (shown only in FIG. 2) are arranged in front of the seat 6 and on the left and right sides.

  For example, as generally understood from FIG. 3, the traveling machine body 1 includes left and right front side frames 9 and a rear side frame 10 that extend in the front-rear direction. The left and right rear side frames 10 are narrower than the front side frame 9, and the front and rear side frames 9 and 10 are connected via a left and right laterally long midframe 11. The left and right front side frames 9 are connected by a front frame 12 at their front end portions.

  The rear side frame 10 is inclined rearward in a side view so as to increase in height as it goes rearward, and left and right laterally long rear frames 13 are connected to the rear ends of the left and right rear side frames 10. The left and right rear columns 14 that support the rear frame 13 are fixed to the rear frame 13. The rear column 14 is disposed inside the rear side frame 10. Of each frame, the mid frame 11 and the rear frame 13 use round pipes, and the other frames use square pipes.

  By connecting the front side frame 9 and the rear side frame 10 with the mid frame 11, the size (thickness), position, and posture of the front side frame 9 and the rear side frame 10 can be easily changed. . This is one of the advantages of this embodiment.

  A rear lateral stay 17 is disposed slightly in front of the rear frame 13, and the rear lateral stay 17 is fixed to a hanger bracket 18 having an upwardly-opening U-shape welded to the rear side frame 10. A gate-type frame 19 having a downward opening is fixed to the front end portions of the left and right rear side frames 10, and the front end portion of the seat support unit 20 is fixed to the gate-type frame 19. The rear part of the seat support unit 20 is fixed to a stay (not shown). The seat 6 is connected to the seat support unit 20 so that the seat 6 can be tilted forward with its front end as a center.

  A plurality of outward branch frames 15 projecting outward in the left and right directions are fixed to the front side frame 9, and the preliminary seedling stand 8 is supported by the branch frames 15. A longitudinal auxiliary frame 22 is disposed outside the side frames 9 and 10, and the auxiliary frame 22 is fixed to the branch frame 15, the rear horizontal stay 17, and the rear frame 13.

  In the present embodiment, a chassis (frame structure) is constituted by the front and rear side frames 9 and 10, the mid frame 11, the front frame 12, the rear frame 13, and the like. As shown in FIG. 2, a portion of the traveling machine body 1 on which a person is placed is covered with a vehicle body cover 23, which includes a front side frame 9, a branch frame 21, an auxiliary frame 22, a rear lateral stay 17, a rear It is supported by a frame 13 or the like. A fertilizer is often arranged behind the seat 6, but is omitted in this embodiment.

  The steering handle 7 is attached to a handle shaft built in the handle post 24. In the present embodiment, the engine 25 is disposed in the front part of the traveling machine body 1, and the original structure is also made in the support structure of the engine 25. That is, two front and rear U-shaped or U-shaped engine support frames 26 that are open upward are fixed to the front side frame 9, and the front engine brackets 27, 28 and the anti-shock are attached to the engine support frame 26. The engine 25 is attached via a vibration rubber 29.

  The engine 25 can be arranged so as to sink below the front side frame 9. The engine 25 is disposed such that the crankshaft is horizontally long and the output pulley is disposed on the left of the cylinder block. The engine 25 is a diesel engine.

  Behind the engine 25, a mission case 31 incorporating a gear group is arranged. An HST (hydrostatic continuously variable transmission) 32 as an example of a continuously variable transmission is attached to the left side surface of the transmission case 31, and the power of the engine 25 is primarily transmitted to the HST 32 by a belt. It is transmitted to the gear group. In addition to the gear group, the transmission case 31 incorporates a clutch, a brake, etc., but the description is omitted because it is not directly related to the present invention.

  A front axle device 33 is attached to the left and right side surfaces of the mission case 31, and the front wheel 4 is attached to the front axle device 33. The front axle device 33 has an upper case fixed to the mission case 31 and an axle case attached to the upper case via a buffer mechanism so that the upper case can be lifted and lowered. It is fixed.

  The rear wheel 5 is attached to the rear axle case 34. The rear axle case 34 has left and right rearward projecting portions 34a, and the rear wheel 5 is fixed to an axle projecting from the rearward projecting portion 34a. Further, the horizontal beam member 35 is passed and fixed to the left and right rearwardly projecting portions 34 a, and the rear column 14 is fixed to the horizontal beam member 35. By using the cross beam member 35 in this way, the load acting on the rear axle case 34 is reduced and durability is improved, and the interval between the left and right rear columns 14 is not restricted by the interval between the rearward projecting portions 34a. Can be set freely.

  As can be understood from FIG. 3, the rear end of the transmission case 31 and the front end of the rear axle case 34 are connected by a hollow rectangular lower connecting body 36, and the lower connecting body 36 and the midframe 11 are U-shaped in a front view. The reinforcing bodies 37 are connected. A fuel tank 38 is disposed between the lower connector 36 and the seat 6.

  The front end of the mission case 31 and the rear engine support frame 26 are connected via a front bracket 39. Accordingly, the transmission case 1, the lower connecting body 36, and the rear axle case 34 constitute a lower structure of the traveling machine body 1, and the lower structure supports the chassis including the front and rear side frames 9 and 10. . The lower structure is supported by the front and rear wheels 4 and 5, and the front side frame 9 is also supported by the front wheels 4 as described above. In this embodiment, the power steering unit to which the handle post 24 is attached is integrated into the transmission case 31 (that is, the gear case of the power steering unit is integrated into the transmission case 31).

  For example, as shown in FIG. 9, the drive shaft 40 and the work power shaft 41 are arranged on the left and right with the lower coupling body 36 interposed therebetween. The drive shaft 40 drives the rear wheels (if a leveling rotor is provided, this is also driven). Of course, the rear wheels 5 rotate in synchronization with the front wheels 4. The work power shaft 41 drives the seedling planting device 2 (and also drives a fertilizer if it is provided), and is connected to an inter-strain case (not shown). Although not shown, the inter-case is fixed to the lower coupling body 36 and the rear axle case 34 via a bracket, and a planting drive shaft (PTO shaft) projects backward from the inter-case to project the fertilizer application drive shaft. Protrudes upward.

(2) Lower structure / fuel tank Next, details of each part will be described. First, the connecting structure of the lower connecting body 36 and the transmission case 31 and the lower connecting body 36 and the rear axle case 34 will be described. This connection structure is clearly shown in FIG. That is, the front support plate 44 is fixed to the front end of the lower connecting body 36 by welding, and is fastened to the rear surface of the transmission case 31 with the bolt 44 '. The rear support plate 45 is welded to the rear end of the lower connecting body 36. The rear support plate 45 is fastened to the front surface of the rear axle case 34 with bolts 45 ′.

  Although the support plates 44 and 45 are rectangular, any shape can be selected as necessary. As shown in FIG. 11, a male fitting portion 36 a that protrudes forward of the front support plate 44 is provided at the front end of the lower coupling body 36, while a male fitting portion 36 a is provided on the rear surface of the transmission case 31. A female fitting part (not shown) that fits tightly is formed, and the fitting strength of these male and female fitting parts increases the fastening strength. It is also possible to provide a fitting portion between the lower coupling body 36 and the rear axle case 34.

  The reinforcing body 37 is manufactured by a round pipe (round steel pipe). The reinforcing body 37 will be described next. For example, as shown in FIG. 8, the mission case 31 is disposed below the upper surface of the midframe 11, and the lower coupling body 36 is fixed to the lower end portion of the mission case 31. More specifically, the gear group is arranged in the mission case 31 so as to change the height in the vertical direction. Therefore, the mission case 31 has a large vertical dimension.

  The lower coupling body 36 is fixed to the lower end portion of the mission case 31. For this reason, the lower coupling body 36 is disposed substantially below the front side frame 9 and the mid frame 11, and the drive shaft 40 is viewed from the side. Are connected to the rear axle case 34 in a posture substantially parallel to the lower coupling body 36.

  The reinforcing body 37 is in a forward inclined posture in a side view so that the height decreases as it goes down, and the upper left and right ends are fixed to the midframe 11 by welding. In addition, as clearly shown in FIG. 12 (A), the upper bracket 46 having a U-shaped downward opening in front view (or rear view) having left and right downward pieces 46a is fixed to the bottom portion 37a of the reinforcing body 37. A lower bracket 47 that fits over the upper bracket 46 is fixed to the lower coupling body 36, and the upper and lower brackets 46, 47 are coupled by left and right horizontally elongated pins 48. Note that bolts and nuts may be used instead of the pins 48 and fastened with them, or the reinforcing body 37 may be fixed to the lower connecting body 36 by welding.

  The upper bracket 46 is provided with a pair of left and right rubber seats 49 that support the lower surface of the fuel tank 38. As shown in FIG. 12A, a downward bulging portion 38a is provided in front of the support portion by the rubber seat 49 on the lower surface of the fuel tank 38, and a fuel outlet 50 is provided in the downward bulging portion 38a. The fuel is sent from the outlet 50 to the engine 25 through a filter (not shown). Since the engine 25 is a diesel system and fuel is forcibly sent by a pump, the outlet 50 of the fuel tank 38 may be below the engine 25.

  As clearly shown in FIG. 8B, the fuel tank 38 is provided with a pair of front and rear flanges 51 and 52, and the front flange 51 is fixed to a tank bracket 53 fixed to the midframe 11 with screws. . As can be understood from FIG. 3, the rear flange 52 of the fuel tank 38 is fastened to the hanger bracket 18 fixed to the rear side frame 10 with screws. The fuel inlet 38 of the fuel tank 38 is located below the seat 6, and when the seat 6 is tilted forward, the fuel inlet 54 is exposed.

  For example, as can be understood from FIG. 12B, a stepped portion 55 is formed on the upper surface of the fuel tank 38 so as to open on the left side and the front side. As shown in FIG. A hydraulic unit 56 that controls the hydraulic cylinder 30 is disposed at 55. By forming the step portion 55, the hydraulic unit 56 can be prevented from greatly protruding to the left side of the fuel tank 38.

(3) Link mechanism / hydraulic cylinder Next, the link mechanism 3 and the hydraulic cylinder 30 will be described. As shown in FIGS. 13 and 14, the link mechanism 3 has a top link 58 and a lower link 59 that are divided into upper and lower parts, and a first pin 60 and The hitch 62 is connected to the second pin 61 so as to be relatively rotatable. A king pin (not shown) protrudes backward from the lower end of the hitch 62, and the seedling planting device 2 is connected through the king pin. Accordingly, the seedling planting device 2 can roll with respect to the traveling machine body 1 by a certain angle.

  The top link 58 is composed of each pipe or channel material and is basically in a straight line shape. An upper bearing cylinder 63 is fixed to the front end of the top link 58 and the upper bearing cylinder 63 is fixed to the left and right rear columns 14. The shaft 64 is fitted. Accordingly, the top link 58 is connected to the rear column 14 so as to rotate up and down around its front end. The upper support shaft 64 has a cylindrical shape, and a third pin 65 is fitted therein.

  The lower link 59 is substantially Y-shaped with one front part and branched backward, and a lower bearing tube 66 is fixed to the front end, and this is fitted to a lower support shaft 67 fixed to the rear column 14, Therefore, the lower link 59 is also connected to the rear column 14 so as to rotate up and down around its front end. The lower support shaft 67 is also cylindrical and has a fourth pin 68 fitted therein.

  The lower link 59 is connected by a fifth pin 70 so that a longitudinal intermediate link 69 is rotated about its rear end. The intermediate link 69 has a U-shape with a downward opening when viewed from the front, and a hollow sixth pin 71 is inserted through the front end of the middle link 69. On the other hand, a pair of left and right arms 72 project upward from the front end of the lower link 59, and the left and right arms 72 support the sixth pin 71 from below.

  On the other hand, the hydraulic cylinder 30 has a cylindrical body 30a and a piston rod 30b, and the base end of the cylindrical body 30a is connected to a bracket 73 fixed to the lower connecting body 36 by a seventh pin 74, while the piston rod For example, as shown in FIG. 6, a plate-like hook 75 with a round hole is fixed to the tip of 30b, and the hook 75 and the intermediate link 69 are connected by the previously described sixth pin 71 (see heads 13 and 14). Has been.

  Accordingly, when the hydraulic cylinder 30 is extended, the link device 3 is rotated downward and the seedling device 2 is lowered, and when the hydraulic cylinder 30 is contracted, the link device 3 is rotated upward and the seedling device 2 is raised. A buffering accumulator 76 is provided at the tip of the cylinder portion of the hydraulic cylinder 30 to reduce the impact. The hydraulic cylinder 30 may be directly connected to the arm 72 without using the intermediate link 69.

(4). Summary As described above, in the present invention, the transmission case 31 and the rear axle case 34 also serve as the structural material of the traveling machine body 1, so that the structure of the traveling machine body 1 is simplified and the cost is reduced and the weight is reduced. (The mission case 31 and the rear axle case 34 have a sturdy structure in view of their functions, so that they fully exhibit their functions as strength members.) Since the lower connecting body 36 and the midframe 11 are connected by the reinforcing body 37, the lower structure made up of the mission case 31 and the like and the chassis made up of the side frames 9, 10 and the like reinforce each other, As a result, the overall structure is extremely sturdy.

  Now, the load of the seedling planting device 2 acts on the hydraulic cylinder 30 as a tensile force, and a bending force acts on the lower coupling body 36 by this tensile force. Thus, since the reinforcing body 37 is stretched from the upper side to the lower connecting body 36, it is possible to remarkably suppress the bending deformation of the lower structure body including the lower connecting body 36, the transmission case 31, and the like, and as a result, high durability. Sex can be secured.

  The fuel tank 38 is surrounded by the reinforcing body 37, so that the height of the fuel tank 38 can be made as low as possible regardless of the presence of the reinforcing body 37. In this embodiment, since the upper bracket 46 for connecting the reinforcing body 37 is also used as a support member for the fuel tank 38, there is an advantage that the structure can be simplified accordingly. Further, for example, as shown in FIG. 12A, a recess 77 for allowing the movement of the hydraulic cylinder 30 is formed on the lower surface of the fuel tank 38, so that the function of the hydraulic cylinder 30 is impaired. The fuel tank 38 can be made as low as possible. This is also one of the advantages of this embodiment.

(5). Modification There are irregularities both on the field and on the road. For this reason, for example, the four wheels 4 and 5 are supported (ground resistance), for example, one wheel is in a floating state. ) Becomes unbalanced, and therefore the weight of the traveling vehicle body 1 may act as an external force that twists the traveling vehicle body 1 around the longitudinal longitudinal axis. In this regard, when the reinforcing frame 37 is provided as in the embodiment, the rigidity of the structure including the chassis, the transmission case 27, the joint material 36, the rear axle case 34, and the rear column 27 is significantly increased. In addition, the resistance to torsion can be significantly improved.

  And in the modification shown in FIG. 15, the reinforcement function is taken so that the rigidity with respect to torsion can be improved further. That is, in this modified example, the left and right side portions of the reinforcing frame 37 are connected by the longitudinal longitudinal reinforcing stays 83, and the reinforcing frame 37, the left and right reinforcing stays 83, and the rear axle case 34 constitute a substantially rectangular frame in plan view. Therefore, the resistance against torsion is increased (of course, the strength against bending is also increased).

  The reinforcing stay 83 uses a square steel pipe, and a front auxiliary bracket 84 having an outward U-shape is welded to a front end portion thereof. On the other hand, a substantially L-shaped support bracket 85 in plan view is welded to the left and right sides of the reinforcing frame 37, and the front auxiliary bracket 84 and the support bracket 85 are fastened by a plurality of bolts 86 and nuts 87. .

  Further, a rear auxiliary bracket 88 in a side view is welded to the rear end of the reinforcing stay 83, and the rear auxiliary bracket 88 is fixed to the front side surface of the rear axle case 34 with a bolt 89. A receiving seat 90 into which a bolt 89 is screwed is provided on the front side surface of the rear axle case 34. The receiving seats 90 are formed one by one in the front and rear, and when higher strength is required, the auxiliary bracket 88 may be spread back and fastened to the four receiving seats 90 as indicated by a one-dot chain line.

(6). Others This embodiment can be embodied in various ways in addition to the above embodiments. For example, the application target is not limited to the riding type rice transplanter, but can be applied to other work machines. It is also possible to replace the seedling planting apparatus of the embodiment with another working apparatus or a transport cart. The traveling machine body is not limited to a traveling system using wheels, and a traveling system using a crawler can also be adopted.

  The side frame does not have to be divided into separate front and rear members, and the whole may be connected to one. The form of the reinforcing body is not limited, and various forms can be adopted. Many variations can be adopted, such as a round pipe structure for the lower coupling body or a multiple-bar system. When the hydraulic cylinder is connected to the lower connecting body, the myon case and the mid frame or the side frame can be connected by a reinforcing body, and in this case, the same effect as the present invention can be exhibited.

  The invention of the present application is embodied in a riding-type farm work machine such as a rice transplanter and exhibits utility. Therefore, it has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Seedling planting device as an example of working device 3 Link device 4 Front wheel 5 Rear wheel 9, 10 Side frame 11 Mid frame 12 Front frame 13 Rear frame 14 Rear column 30 Hydraulic cylinder 31 Mission case 34 Rear axle case 36 Lower part Connecting body 37 Reinforcing body 38 Fuel tank

Claims (2)

In the riding type agricultural machine with the traveling machine body (1) that supports the chassis with the lower structure,
The lower structure has a configuration in which a transmission case (31) and a rear axle case (34) disposed behind the transmission case are connected by a lower connecting body (36).
The chassis includes left and right side frames (9) and (10) extending in the front-rear direction, and left and right laterally long rear frames (13) that connect the left and right side frames (9) and (10) at the rear ends thereof, The rear frame (13) is supported by the rear axle case (34) via the rear column (14),
The left and right side frames (9) and (10) are supported by the lower coupling body (36) via the reinforcing body (37).
Riding type farm work machine. The left and right side frames (9) and (10) include a front side frame (9) in a substantially horizontal position located in front of the left and right horizontally long midframe (11) connecting the front and rear middle portions, and the midframe ( 11) and a rear side frame (10) that is inclined so as to be higher as it goes rearward.
The riding type agricultural working machine according to claim 1.

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