JP2011102050A - Riding type agricultural working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding type rice-planting machine contributable to an improvement in traveling stability, and capable of enhancing the rigidity of a chassis. <P>SOLUTION: A traveling vehicle body 1 includes right and left side frames 21, a front frame 24 connected to these frames, a mid frame 25 and a rear frame 26. The side frames 21 are separated into a front side frame 22 of a substantially horizontal attitude and a rear side frame 23 of a backward inclined attitude, and the rear side frame 23 approaches inside more than the front side frame 22. The rear frame 26 is supported by a rear column 27, and the rear column 27 is installed in a rear axle case 53. Since an interval of the front side frame 22 is large, even an engine 6 of a large lateral width can be arranged in a state of sinking under the front side frame 22, to thereby contribute to an improvement in the traveling stability. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a riding type farm working machine having a chassis having a frame structure like 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, as main elements, a traveling vehicle body supported by front wheels and rear wheels, and a seedling planting device disposed behind the traveling vehicle body. Adjustably linked. The traveling vehicle body is provided with a seat and a steering handle, and is equipped with an engine, and traveling and seedling work are performed by the power of the engine.

  A traveling vehicle body usually has a chassis (framework) made of steel materials such as steel pipes and channel materials and supports a step (body cover) on which a person is placed. Has left and right side frames extending in the front-rear direction as main members, and the left and right side frames are connected by a horizontally long frame material. A link device is connected to the seedling planting device and the traveling vehicle body so as to be relatively rotatable, and the traveling vehicle body and the link device are connected by a hydraulic cylinder.

  An example of a specific structure of the chassis is described in Patent Documents 1 and 2. Of these, in Patent Document 1, the chassis has the left and right side frames bent so that the substantially rear half of the chassis is an inclined portion that is raised backward, and the horizontally elongated midframe penetrates the left and right inclined portions. A rear column is fixed to the rear end of the left and right inclined portions of the side frame. The left and right rear columns are continuous in series at the upper end. That is, the rear column is configured by bending one steel material into a U-shape. The rear column is supported by a rear axle case to which the rear wheels are attached.

  On the other hand, the chassis of Patent Document 2 has a configuration in which left and right side frames (front frames) are separated into front and rear, and front and rear members are connected by a single mid frame (center left and right horizontally long frame). In this patent document 2, the side frame has a space between the left and right front members that is narrower than the space between the left and right rear members. The engine is placed in the area between the rear members.

Japanese Patent No. 3804926 JP 2007-282640 A

  Now, it is preferable that the traveling vehicle body has a lower center of gravity as much as possible in order to improve traveling stability. In this case, a riding type rice transplanter attaches a seedling planting device to the rear part of the traveling vehicle body, so that a heavy engine as in Patent Document 1 is used. If it arrange | positions in the front part of a traveling vehicle body, it can be said that it can balance the front-rear weight of a traveling vehicle body, and is suitable. Further, in Patent Document 1, since the transmission case and the rear axle case also serve as the structural material of the traveling vehicle body, there is an advantage that the structure of the entire traveling vehicle body can be simplified.

  The present invention has been made in view of such a current situation, and in particular, has been made to provide a riding-type agricultural machine having an improved chassis.

  A riding-type agricultural machine according to the present invention includes a chassis of a traveling vehicle body on which a person rides and drives, a front and rear longitudinal left and right side frame, a lateral midframe connected to a front and rear midway part of the left and right side frame, and the left and right As a configuration having a rear frame that connects a side frame at the rear end, the rear frame is supported by a rear axle case via a rear column, and the engine is disposed at a position in front of the mid frame, A transmission mission case is disposed behind the engine.

  In the first aspect of the invention, the left and right side frames are separated into a substantially horizontal front member and a rear inclined rear member, and the front and rear members are arranged in front of the rear member. It is fixed to the midframe in a state shifted to the left and right inside of the part members, the engine is disposed between the front members in the left and right side frames, and the front members of the side frames constitute a driving floor. And a seat is supported by a rear member of the side frame.

  According to a second aspect of the present invention, in the first aspect, the front and rear members constituting the side frame are each formed of a square steel pipe, while the mid frame and the rear frame are formed of a circular steel pipe. According to a third aspect of the present invention, in the first or second aspect, the mid frame and the rear frame protrude from the left and right outer sides of the side frame, and the step is also performed by a longitudinal longitudinal auxiliary frame provided in the protruding portion. It is supported.

  In the present invention, since the side frame is separated into the front member and the rear member, it is possible to change the support mode in the front part from the mid frame and the support mode behind the mid frame. Since the distance between the front members is wide, it is also possible to place an engine with a large left and right width under the front member, which improves the driving stability by lowering the center of gravity of the traveling vehicle body. Can contribute.

  Now, since the rear end of the rear frame is connected to the upper end of the rear column, the rear member of the side frame inevitably needs to have a higher rear end than its front end. The rear member is bent in a side view so that the rear part faces upward, but this is troublesome to bend. On the other hand, in the present invention, since the rear member is inclined as a whole, it is not always necessary to perform the bending process, and as a result, the processing cost can be suppressed.

  When supporting a working device such as a seedling planting device with the rear strut, as in Patent Documents 1 and 2, a link device is connected to the left and right rear struts, and the working device is supported by the link device so as to be movable up and down. However, since the horizontal width of the link device is generally not so large, the distance between the two left and right rear columns is not so large, but the side frame is configured as in Patent Document 2. If the distance between the left and right rear members is large, there is a concern that a large bending load will be applied to the rear frame due to the left and right rear struts moving largely inside the left and right rear members.

  On the other hand, in the present invention, since the distance between the left and right rear members is smaller than the distance between the front members, the side frame can reduce the difference between the distance between the left and right rear frames and the distance between the left and right rear members as much as possible. It is possible to reduce the bending load applied to the rear frame as much as possible, and as a result, the rear frame can ensure the required strength without increasing its size.

  The side frame can be a round steel pipe or a grooved steel, but if a square steel pipe is used as in claim 2, it has excellent strength and the outer periphery is composed of four flat surfaces. There is an advantage that positioning and superposition can be easily performed when attaching the member.

  In addition, the mid frame and the rear frame can use a square steel pipe or a grooved steel, but if a round steel pipe is used as in claim 2, the mid member and the rear member are matched. The rear frame can be easily matched between the rear member and the rear column. In addition, since the bending strength of the round steel pipe is constant regardless of the direction in which the load is applied, it is not necessary to confirm the posture at the time of assembling, so that the assembling is easy.

  When the auxiliary frame is provided as in the third aspect, the mid frame and the rear frame are reinforced by the auxiliary frame. Therefore, there is an advantage that the overall rigidity of the traveling vehicle body can be increased.

It is the whole rice transplanter in the state where the body cover was removed. (A) is the whole top view of the rice transplanter in the state which attached the step, (B) is a perspective view of the traveling vehicle body which attached the step. It is a partial separation perspective view of a traveling body. It is a top view of a traveling vehicle body. It is a side view of a traveling vehicle body. (A) is a separated perspective view, (B) is a perspective view of the mission case as seen from the rear, and (C) is a perspective view of the rear axle case as seen from the front. It is a 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, (A) is an isolation | separation perspective view, (B) is an isolation | separation side view, (C) is sectional drawing seen from CC view direction of (B) in the assembled state.

  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 description and claims, the words “front and rear” and “left and right” are used to specify the direction, and these words are displayed with reference to the operator seated in the forward direction of the rice transplanter. . The front view direction is the direction seen from the direction facing the forward direction of the rice transplanter.

(1). Outline of rice transplanter First, the outline of rice transplanter will be explained. As shown in FIGS. 1 and 2A, the rice transplanter has a traveling vehicle body 1 and a seedling planting device 2 as basic elements, and the seedling planting device 2 is connected to the rear portion of the traveling vehicle body 1 via a link device 3. It is connected to the hoist freely. The traveling vehicle 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 from an engine 6 disposed at the front of the traveling vehicle body 1. The rear wheel 5 may be supplemented with a double system or a triple system.

  The engine 6 of this embodiment is a water-cooled diesel in-line three-cylinder system. As shown in FIG. 3, the engine 6 includes an engine body 7 provided with a crankcase, a cylinder block, and the like, and a radiator 8 disposed on the right side thereof. have. The engine body 7 is arranged in a horizontal posture in which the crankshaft 9 is horizontally long.

  The traveling vehicle body 1 includes a seat 10 on which an operator sits and a steering handle 11 disposed in front of the seat 10. The seat 10 and the steering handle 11 are arranged at the left and right intermediate positions of the traveling vehicle body 1. The engine 6 is covered with a front and rear split bonnet 12, and spare seedling stands 13 are arranged on both the left and right sides of the bonnet 12. The preliminary seedling stand 13 displays only a skeleton in the drawing, and actually a shelf board on which a seedling mat is placed is attached.

  Most of the traveling vehicle body 1 except for the portion surrounded by the bonnet 12 is covered with a step (body cover) 14 so that a person can rest on it. Step 14 is divided into a front step 14a that constitutes the floor of the driver's seat and a rear step 14b that spreads from the front step 14a to the left and right sides and the rear of the seat 10 when stepped up. The front and rear steps 14a and 14b are integrally continuous through a wall.

  Further, when viewed from the parts, the step 14 includes a first member 15 that surrounds the bonnet 12 from the left and right sides and the front side, a pair of left and right second members 16 disposed behind the first member 15, and the second member 16. It is divided into a third member 17 and a fourth member 18 located on both the left and right sides. A rear cover 19 is disposed behind the second member 16.

  The left and right second members 16 form the core of step 14 and are divided on both the left and right sides with the center line of the traveling vehicle body 1 therebetween. Some rice transplanters have different numbers of planting lines. For example, in the 6-row planting model, only the first member 15 and the second member 16 are used, and in the 8-row planting model, the third member 17 is used. The fourth member 18 is attached. Generally, a mat made of rubber or the like is fixed to the front step 14a (the mat may be attached to the rear step 14b).

(2). Chassis Structure As can be generally understood from FIG. 3, for example, the traveling vehicle body 1 includes left and right side frames 21 that are longitudinally long. The left and right side frames 21 are separated into a front member 22 and a rear member 23 (hereinafter, for convenience, the front member 22 is indicated as “front side frame 22” and the rear member 23 is indicated as “ Referred to as rear side frame 23).

  The left and right rear side frames 23 are located inside the left and right front side frames 22. Therefore, the left-right distance of the rear side frame 23 is smaller than the left-right distance of the front side frame 22. The front and rear side frames 22 and 23 are connected via a horizontally long mid frame 25. The left and right front side frames 22 are connected to each other by a horizontally long front frame 24 at a front end portion thereof.

  The rear side frame 23 is tilted rearward in a side view so as to increase in height as it goes rearward, and a laterally long rear frame 26 is connected to the rear ends of the left and right rear side frames 23. The left and right rear columns 27 that support the rear frame 26 are fixed to the rear frame 26. The left and right rear columns 27 are arranged inside the left and right rear side frames 23. More precisely, the left and right rear columns 27, the left and right rear side frames 23, and the left and right front side frames 22 are arranged symmetrically with respect to the longitudinal center line of the traveling vehicle body 1.

  The mid frame 25 and the rear frame 26 use round pipes. On the other hand, the front side frame 22 and the rear side frame 23, the rear frame 26, the front frame 24, and the rear column 27 use square steel pipes. The rear side frame 23 is thinner than the front side frame 22. When a square steel pipe is used, various members can be easily attached, and the step 14 can be stably supported.

  A rear lateral stay 28 is disposed slightly in front of the rear frame 26, and the rear lateral stay 28 is fixed to an upwardly-opening U-shaped hanger bracket 29 welded to the rear side frame 23. A gate-type frame 30 having a downward opening is fixed to the front end portion of the left and right rear side frames 23, and the front end portion of the seat support unit 31 is fixed to the gate-type frame 30. The rear part of the seat support unit 31 is fixed to a stay (not shown). The seat 10 is connected to the seat support unit 31 so that the seat 10 can be tilted forward with its front end as a center.

  A plurality of outward branch frames 32 projecting outward in the left and right directions are fixed to the front side frame 22, and the lower end of the preliminary seedling stand 13 is fixed to the outward branch frame 32 via a bracket. A first auxiliary frame 33 that is long in the front-rear direction is fixed to the tip of the outward branch frame 32.

  The first auxiliary frame 33 is bent in a plan view and a side view, and is also fixed to the tips of the mid frame 25, the rear lateral stay 28, and the rear frame 26. A second auxiliary frame 34 located on the left and right inner sides of the first auxiliary frame 33 is fixed to the mid frame 25, the rear horizontal stay 28, and the rear frame 26. The mid frame 25 and the rear frame 26 protrude greatly to the left and right outside of the side frame 21, and both have substantially the same length.

  In this embodiment, a chassis is constituted by the side frame 21, the mid frame 25, the front frame 24, the rear frame 26, the rear lateral stay 28, and the auxiliary frames 33 and 34, and most of the step 14 is supported by this chassis. ing. Although a fertilizer is often placed behind the seat 10, it is not shown in the drawing. As shown in FIG. 3, the steering handle 11 is attached to a handle shaft built in the handle post 36.

(3). Engine / mission case As can be easily understood from FIG. 3, the front side frame 22 has a U-shape or U-shape in front view opened upward in a substantially front half of the front side frame 22 before the handle post 36. The front and rear engine support frames 37 are fixed, and the front and rear engine support frames 37 support the engine 6. To be precise, a pair of front and rear upper brackets 38 are fixed to the engine body 7 with bolts, while a lower bracket 39 is fixed to the engine support frame 37, and the upper bracket 38 is a left and right vibration-absorbing unit. It is attached to the lower bracket 39 with bolts and nuts via 40.

  Therefore, the engine body 7 is disposed in a state where it is partially sunk below the front side frame 22. As shown in FIG. 3, a side bracket 41 is fixed to the right end portion of the front and rear engine support frame 37, and the radiator 8 is supported by the side bracket 41. The engine support frame 37 is welded to the lower surface of the front side frame 22, but may be welded to the side surface of the front side frame 22. The front and rear engine support frames 37 are connected by a reinforcing member 37a.

  The output shaft of the engine 6 protrudes to the left side of the engine body 7, and the output pulley 42 and the flywheel 43 are fixed to the output shaft. Further, as shown in FIG. 4, the silencer 45 is disposed on the left outer side of the engine 6, and the silencer 45 is suspended and supported by a stay 46 fixed to the front side frame 22 and the first auxiliary frame 33. ing.

  For example, as shown in FIG. 5, a mission case 44 incorporating a gear group is disposed behind the engine 6. An HST (hydrostatic hydraulic continuously variable transmission) 47 as an example of a continuously variable transmission is attached to the left side surface of the mission case 44, and the power of the engine 6 is primarily transmitted to the HST 47 by a belt 48. Then it is transmitted to the gear group. In addition to the gear group, the transmission case 44 includes a clutch, a brake, and the like. However, the description is omitted because it is not directly related to the present invention.

  A front axle device 49 is attached to the left and right side surfaces of the mission case 44, and the front wheel 4 is attached to the front axle device 49. The front axle device 49 has an upper case fixed to the mission case 44 and an axle case attached to the upper case via a buffer mechanism so as to be movable up and down. The upper case is a front side frame 22 of the side frame 21. Also fixed.

  As shown in FIG. 3, a front bracket 50 projecting rearward is fixed to the engine support frame 37 on the rear side, and the flot bracket 50 is connected to the front end portion of the mission case 44 with a pin (not shown). ing. For example, as shown in FIG. 3, a power steering unit 51 is incorporated in the front end portion of the mission case 44, and a handle post 36 is fixed to the power steering unit 51.

(4) Connection with Rear Axle Case / Fuel Tank The rear wheel 5 is attached to the rear axle case 53. The rear axle case 53 has left and right rearward projecting portions 53a, and the rear wheel 5 is fixed to an axle projecting from the rearward projecting portion 53a. Further, the horizontal beam member 54 is inserted and fixed to the left and right rearwardly projecting portions 53 a, and the rear column 27 is fixed to the horizontal beam member 54. By using the cross beam member 54 in this way, the interval between the left and right rear columns 27 can be arbitrarily set without being restricted by the size of the rear axle case 53, and the rigidity of the transmission case 44 can be increased.

  As clearly shown in FIG. 7, the rear end of the transmission case 44 and the front end of the rear axle case 53 are connected by a circular joint 55, and the joint 55 and the mid frame 25 are U-shaped reinforcing frames. (Reinforcing body) 56 are connected. A fuel tank 57 is disposed between the joint 55 and the seat 10. For example, as clearly shown in FIG. 5, the fuel tank 57 is arranged so as to sink greatly below the upper surface of the front step 14a. For this reason, the fuel tank 57 can be increased in height to increase its capacity. It is possible.

  For example, as schematically shown in FIG. 6B, the drive shaft 58 and the work power shaft 59 are arranged in a distributed manner on the left and right with the joint 55 interposed therebetween. The drive shaft 58 drives the rear wheel 5 (and also drives the leveling rotor if provided), and is connected to the rear axle case 53. The work power shaft 59 drives the seedling planting device 2 (and fertilizer application device), and is connected to an inter-strain case (not shown). In addition, from the inter-case, the planting drive shaft (PTO shaft) protrudes backward and the fertilization drive shaft protrudes upward.

  A front support plate 60 is fixed to the front end of the joint 55 by welding, and this is fastened to the rear surface of the transmission case 44 with a bolt 61, while a rear support plate 62 is fixed to the rear end of the joint 55 by welding. Are fastened to the front surface of the rear axle case 53 with bolts 63.

  The reinforcing frame 56 is made of a round pipe (round steel pipe). The reinforcing frame 56 is in a forward inclined posture in a side view so that the height decreases as going backward, and the upper left and right ends are fixed to the mid frame 25 by welding. For example, as clearly shown in FIG. 5, an upper bracket 64 having a U-shaped downward opening in front view (or rear view) is fixed to the bottom of the reinforcing frame 56, while the upper bracket 64 covers the joint 55. The lower bracket 65 that fits in is fixed, and the upper and lower brackets 64, 65 are fastened with left and right laterally long bolts (may be connected with pins or welded).

  As shown in FIG. 6A, the upper bracket 64 is provided with a pair of left and right rubber seats 66, and the rubber seat 66 supports the lower surface of the fuel tank 57. Similarly, as shown in FIG. 6A, the fuel tank 57 is provided with a pair of front and rear flanges 67 and 68, and the front flange 67 is fixed to the tank bracket 25a fixed to the midframe 25 with screws. Yes. The rear flange 68 of the fuel tank 57 is fastened to the hanger bracket 18 (see FIG. 5) fixed to the rear side frame 23 with screws. The fuel filling port 69 of the fuel tank 57 is located below the seat 10, and when the seat 10 is tilted forward, the fuel filling port 69 is exposed.

(5) Link mechanism / hydraulic cylinder Next, the link mechanism 3 and the hydraulic cylinder 71 will be described. As shown in FIGS. 7 and 8, the link mechanism 3 has a top link 72 and a lower link 73 that are divided into upper and lower parts, and a first pin 74 and a first link 74 are provided at the rear ends of the links 72 and 73. A hitch 76 is connected by two pins 75 so as to be relatively rotatable. A king pin (not shown) protrudes backward at the lower end portion of the hitch 76, and the seedling planting device 2 is connected through the king pin. Therefore, the seedling planting device 2 can roll the vehicle body 1 by a certain angle.

  The top link 72 is formed of a square pipe or a channel material and basically has a linear shape. An upper bearing cylinder 77 is fixed to the front end of the top link 72 and the upper bearing cylinder 77 is fixed to the left and right rear columns 27. The shaft 78 is fitted. Accordingly, the top link 72 is connected to the rear support column 27 so as to rotate up and down around its front end. The upper support shaft 78 has a cylindrical shape, and a third pin 79 is fitted therein.

  The lower link 73 is substantially Y-shaped with one front part and branching backward. The lower bearing cylinder 80 is fixed to the front end, and is fitted to the lower support shaft 81 fixed to the rear support column 27. Accordingly, the lower link 73 is also connected to the rear column 27 so as to rotate up and down around its front end. The lower support shaft 81 is also cylindrical, and the fourth pin 82 is fitted therein.

  The lower link 73 is connected by a fifth pin 84 so that a front and rear longitudinal intermediate link 83 rotates around the rear end. The intermediate link 83 has a U-shape with a downward opening when viewed from the front, and a hollow sixth pin 85 is inserted into the front end portion thereof from the left to the right. On the other hand, a pair of left and right arms 86 project upward from the front end of the lower link 73, and the sixth pin 85 is supported from below by the left and right arms 86.

  On the other hand, as shown in FIG. 7, the hydraulic cylinder 71 has a cylinder 71 a and a piston rod 71 b, and the base end of the cylinder 71 a is connected to a bracket 87 fixed to the joint 55 by a seventh pin 88. Has been. On the other hand, for example, as shown in FIG. 5, a plate-like hook 89 with a round hole is fixed to the tip of the piston rod 71b, and the hook 89 and the intermediate link 83 are connected by a sixth pin 85 shown in FIG. Yes.

  Therefore, when the hydraulic cylinder 71 is extended, the link device 3 is rotated downward and the seedling device 2 is lowered. When the hydraulic cylinder 71 is contracted, the link device 3 is rotated upward and the seedling device 2 is raised. An accumulator 90 for shock reduction is provided at the tip of the cylindrical portion of the hydraulic cylinder 71. The hydraulic cylinder 71 may be directly connected to the arm 86 without using the intermediate link 83.

(6) Summary In the above configuration, since the front side frame 22 is wider than the rear side frame 23, the horizontally mounted engine 6 can be disposed in a state where it is sunk below the front side frame 22, Therefore, the center of gravity of the traveling vehicle body 1 can be lowered to improve the traveling stability. In addition, since the rear side frame 23 does not protrude greatly outside the left and right rear columns 27, even if a bending load is applied to the rear frame 26 by, for example, a person performing the seedling work on the rear step 14b, the rear frame It is possible to prevent or remarkably suppress the bending of the portion between the left and right rear side frames 23 of 26.

  Further, when the levers are attached to the rear side frame 23 of the side frame 21 via brackets, the rear side frame 23 can be disposed slightly outside the seat, so that the levers are used by a seated operator. It can be placed in a comfortable position. This is also one of the advantages of the present invention.

  In the present invention, since the transmission case 44 and the rear axle case 53 also serve as the structural material of the traveling vehicle body 1, the structure of the traveling vehicle body 1 can be simplified to contribute to cost reduction and weight reduction (the transmission case 44 and the rear axle). Since the axle case 53 has a sturdy structure in terms of its function, it fully exhibits its function as a strength member.

  In addition, there are irregularities both on the field and on the road. For this reason, the support state (ground resistance) of the four wheels becomes unbalanced, for example, the vehicle travels with one wheel floating, For this reason, 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 56 is provided as in the embodiment, the rigidity of the structure including the chassis, the transmission case 44, the joint 55, the rear axle case 53, and the rear column 27 is significantly increased. The resistance to torsion can be greatly improved.

(7). Modified Example As described above, the torsional force acts on the traveling vehicle body 1 due to the unevenness on the field and the road, but in the modified example shown in FIG. 9, a reinforcing function is provided so as to further improve the rigidity against torsion. That is, in this modified example, the left and right side portions of the reinforcing frame 56 are connected by the longitudinal longitudinal stays 92 to increase the rigidity against torsion (of course, the strength against bending is also increased).

  More specifically, a) the reinforcing frame 56, the left and right reinforcing stays 92, and the rear axle case 53 form a substantially rectangular frame in plan view, and b) the reinforcing stays 92 are lowered downward as viewed from the side. And the rear axle case 53, the reinforcing stay 92, the reinforcing frame 56, and the joint 55 constitute a three-dimensional truss structure. In combination, the rigidity against torsion is significantly improved.

  The reinforcing stay 92 uses a square steel pipe, and a front auxiliary bracket 93 having an outward U-shape is welded to a front end portion thereof. On the other hand, a substantially L-shaped support bracket 94 in plan view is welded to the left and right sides of the reinforcing frame 56, and the front auxiliary bracket 93 and the support bracket 94 are fastened by a plurality of bolts 95 and nuts 96. .

  Further, a rear auxiliary bracket 97 having a fan shape in side view is welded to the rear end of the reinforcing stay 92, and the rear auxiliary bracket 97 is fixed to the front side surface of the rear axle case 53 with a bolt 98. A receiving seat 99 into which a bolt 98 is screwed is provided on the front side surface of the rear axle case 53. The receiving seats 99 are formed in pairs on the front and rear, and if higher strength is required, the rear auxiliary bracket 97 may be fastened to the four receiving seats 99 (in this case, the reinforcing stay 92 is also thicker). preferable.). Although the support bracket 94 is provided with the side plate 94a only at the rear portion, the side plate 94a may be provided at both front and rear ends.

  The torsional force acting on the traveling vehicle body 1 is proportional to the weight of the vehicle body, the distance between the left and right wheels, and the distance between the front and rear wheels. The necessary strength can be ensured without providing a stub, and it can be said that the reinforcement stay 92 should be used in the case of 8-row planting or 10-row planting. Looking at this in reverse, the basic framework of the traveling vehicle body 1 is shared by models with different numbers of planting strips (for example, 4-8 planting, 6-10 planting), and a reinforcing stay 92 is used as necessary. Therefore, it is possible to suppress the manufacturing cost of the entire model group in preparing a plurality of models with different numbers of planting lines.

  The reinforcing stay 92 may use a member having another cross-sectional shape such as a round pipe, and the fixing structure of the reinforcing stay 92 to the reinforcing frame 56 and the rear axle case 53 can be arbitrarily set. The reinforcing stay 92 may be fixed to the mid frame 25 instead of or in addition to fixing to the reinforcing frame 56.

(8). Others This embodiment can be embodied in various ways other than the above embodiments. For example, the application target is not limited to the riding type rice transplanter, but can be applied to other working machines such as a seedling transplanter and a lawn mower. It is also possible to replace the seedling planting apparatus of the embodiment with another working apparatus or a transport cart. The traveling vehicle body is not limited to a traveling method using wheels, and a traveling method using a crawler or a caterpillar can also be adopted. You may use a wheel and a crawler together.

  It is also possible to connect the mid frame and the rear frame by a plurality of left and right rear members (in this case, two rear members on one side may be arranged inside and outside the front member).

  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 can be used industrially.

DESCRIPTION OF SYMBOLS 1 Running vehicle body 4,5 Wheel 6 Engine 14 Step 14a Front part 14b Rear part 21 Side frame 22 Front side frame (front member)
23 Rear side frame (rear member)
24 Front frame 25 Mid frame 26 Rear frame 44 Mission case 53 Rear axle case 55 Joint

Claims (3)

A chassis of a traveling vehicle that is carried by a person, a front and rear longitudinal left and right side frame, a laterally mid frame coupled to the front and rear middle portions of the left and right side frames, and a rear frame that couples the left and right side frames at the rear end The rear frame is supported by a rear axle case via a rear column, and the engine is disposed at a position in front of the mid frame, and a transmission mission case on the rear side of the engine It is a configuration that is arranged,
The left and right side frames are separated into a substantially horizontal front member and a rearward tilting rear member, and these front and rear members are fixed to the mid frame with the rear member being shifted to the left and right inside of the front member. Has been
The engine is disposed between the front members in the left and right side frames, the front members of the side frames support the front step constituting the driving floor, and the rear members of the side frames support the seat. Yes,
Riding type farm work machine. The front and rear members constituting the side frame are each made of a square steel pipe, while the mid frame and the rear frame are made of a circular steel pipe,
The riding type agricultural working machine according to claim 1. The mid frame and the rear frame protrude outside the left and right sides of the side frame, and the step is supported by front and rear auxiliary frames provided in the protruding portion.
The riding type agricultural working machine according to claim 1 or 2.

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