WO2011058974A1

WO2011058974A1 - Riding agricultural operation machine

Info

Publication number: WO2011058974A1
Application number: PCT/JP2010/069948
Authority: WO
Inventors: 智之黒田
Original assignee: ヤンマー株式会社
Priority date: 2009-11-10
Filing date: 2010-11-09
Publication date: 2011-05-19
Also published as: IN2012DN03282A; TW201127274A; CN102612458A; CN102612458B; KR101717161B1; TWI505770B; KR20120084761A

Abstract

A rice planting machine comprises a traveling automotive body. The traveling automotive body comprises a chassis. The chassis comprises side frames (9, 10), a mid-frame (11), a front frame (12), and rear frames (14). A transmission case (27) and an axle case (34) also function as strength members of the traveling automotive body. The transmission case (27) and the axle case (34) are connected together by a lower connection body (36). An engine (26) is supported by engine supports (55) each having an upward open U-shape. The engine supports (55) are fixed to the front side frames (9). The engine (26) is disposed in such a way as to be sunk below the front side frames (9). Therefore, the center of gravity of the traveling automotive body (1) is positioned low, resulting in high stability.

Description

Riding machine

The present invention relates to a riding type farm working machine driven by an engine like a riding type rice transplanter.

There is a riding rice transplanter as an example of a riding farming 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. It can also be called a traveling part.

A traveling vehicle body usually has a chassis (framework / machine frame) made of a frame material (steel material) such as a steel pipe or a channel material. It has a side frame, and 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 vehicle body so as to be relatively rotatable, and the traveling vehicle body and the link device are connected by a hydraulic cylinder.

There are cases where the engine is arranged in front of and behind the operation floor, and specific configurations when the engine is arranged in front of the operation floor are described in

Patent Documents

1 and 2, for example. That is, in Patent Document 1, the left and right side frames constituting the chassis support the engine, and the portion of the side frame that supports the engine has a horizontal posture. On the other hand, in Patent Document 2, the front portion of the side frame is formed in an inclined portion that becomes lower toward the front end, and the engine is supported by a member connected to the inclined portion.

A structure similar to Patent Document 1 is disclosed in Patent Document 3. That is, in this Patent Document 3, the left and right side frames 44 are bent in a side view so that the height increases as the rear half of the frame goes rearward (that is, the rear half is formed as an inclined portion). While the front part of the frame 44 is connected by a horizontally long front frame 41, the rear ends of the left and right side frames 44 are respectively fixed to the upper side surface of the rear frame 43 rising from the rear axle case 38, and the left and right rear columns A left and right horizontally long rear frame is bent at the upper end of 43.

In Patent Document 3, 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. 4139669 Japanese Unexamined Patent Publication No. 2000-201510 Japanese Patent No. 3804926

Now, it is preferable that the center of gravity of the traveling vehicle body be as low as possible from the viewpoint of ensuring traveling stability. Since the engine has a considerable weight, lowering the position of the engine is beneficial for lowering the center of gravity of the traveling vehicle body. In this respect, Patent Document 2 can contribute to lowering the center of gravity of the traveling vehicle body because the mounting height of the engine can be lowered. However, if the front part of the side frame is inclined, the support structure of other members supported by the front part of the side frame must be greatly changed, which may increase the overall design cost and manufacturing cost. Is done.

In other words, taking a riding-type agricultural machine as an example, as shown in FIG. 2 of Patent Document 1, for example, the body cover on which a person is placed is almost always arranged in a state of spreading to the left and right sides of the engine. Yes, the part of the body cover that protrudes from the left and right sides of the engine is supported by the side frame directly or via a bracket. However, if the front part of the side frame is inclined as in Patent Document 2, the body cover is supported. Since the structure must be changed, the design and manufacturing costs increase.

In addition, as described in FIGS. 1 and 2 of Patent Document 1, a pair of left and right spare seedling stands are arranged at the front portion of the side frame in the riding type farm working machine, and these spare seedling stands are arranged via brackets. Although it is often fixed to the side frame, if the front part of the side frame is inclined as in Patent Document 2, the support structure of the preliminary seedling table must be changed. Manufacturing costs increase.

The present invention has an object to improve such a current situation. On the other hand, in Patent Document 3, the mission case and the rear axle case play the role of a structural material (strength member) that supports other members, which can be said to contribute to simplification of the structure of the traveling machine body and cost reduction. . The invention of the present application also aims to further improve the rigidity of the traveling machine body when the transmission case and the rear axle case are also used as the structural material of the traveling machine body as in Patent Document 3.

Furthermore, although many new configurations are disclosed in the present application, providing these new configurations can also be regarded as a part of the purpose of the present application. In other words, it should be understood that the novel configuration disclosed in the present application can be an independent invention regardless of the presence or absence of claims.

A riding-type agricultural machine according to the present invention has a traveling vehicle body on which a person rides and steers, and an engine mounted on the traveling vehicle body. The traveling vehicle body includes a chassis and a traveling mission case disposed below the cockpit. The chassis is made of a frame material and has a basic configuration in which power is transmitted from the engine to the inside of the traveling mission case.

This application has many inventions. Of these, the first invention is the above-described basic configuration, wherein the chassis and the mission case are arranged in a state where the mission case is positioned below the chassis, and the front, rear, or both front and rear portions of the mission case. In addition, a member support portion located below the upper surface of the mission case is provided. As specific examples of the member support portion, for example, an engine support support frame 55 shown in FIG. 3 (an example of a front member support portion) or a fuel tank support receiving material 38 shown in FIG. An example of a side member support part) is given.

According to a second invention, in the first invention, an engine support on which the engine is mounted as a front member support portion positioned in front of the transmission case is disposed at a portion of the chassis in front of the transmission case. Projecting downward in a state of being located below the upper surface of the transmission case, and the engine is supported by the engine support with its lower surface submerged below the chassis.

In a third aspect based on the second aspect, the chassis has a structure in which left and right side frames extending in the front-rear direction are connected by a horizontally long frame, and the engine support is provided at a front portion of the left and right side frames. .

In a fourth aspect based on the third aspect, the engine support includes one or a plurality of support frames each having an upward U-shape when viewed from the front, and a shock absorber is provided at the bottom of the support frame. The engine is attached via

According to a fifth invention, in the fourth invention, a plurality of the support frames are arranged side by side, and the plurality of support frames are connected by one or a plurality of reinforcing bodies protruding below the support frame. Yes.

According to a sixth aspect of the present invention, in the first invention, a front axle device that supports a front wheel is connected to the transmission case, and a rear axle case that rotatably supports a rear wheel is disposed behind the transmission case. The transmission case and the rear axle case are connected by a lower connecting body positioned below the upper surface of the transmission case, and a rear member support portion positioned behind the transmission case is connected to the lower connecting body. (For example, the receiving material 38 for supporting the fuel tank shown in FIG. 11A) is provided.

In a seventh aspect based on the sixth aspect, the chassis has left and right side frames extending in the front-rear direction, left and right laterally middle frames that connect the left and right side frames in the middle in the front-rear direction, and 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 mid frame or the left and right side frames and the lower coupling body are reinforced. Connected with the body.

According to an eighth invention, in the seventh invention, the reinforcing body is U-shaped upward in a front view, and is inclined forward in a side view so as to become lower toward the rear, and is provided at the bottom of the reinforcing body. The fuel tank is supported by the rear member support portion.

According to a ninth invention, in the seventh invention, the reinforcing body is made of a steel pipe and has a frame structure, and the reinforcing body has a substantially U-shaped or substantially V-shaped configuration in a front view (an inverted trapezoidal shape or a half-shaped shape). It is also possible to adopt a circular form.)

A tenth aspect of the invention is the seventh aspect of the invention, wherein the side frame is a front side frame in a substantially horizontal posture located in front of the mid frame, and a rear side that is located behind the mid frame and is inclined to become higher toward the rear. The rear side frame is fixed to the mid frame on the left and right inner sides of the front side frame, while the reinforcing body is in the vicinity of the front end of the rear side frame. Fixed to the midframe.

An eleventh aspect of the present invention is the first aspect of the present invention, wherein the engine support on which the engine is mounted is disposed as a rear member support portion disposed behind the transmission case, and the lower end of the engine support is positioned below the upper surface of the transmission case. The engine is supported by the engine support with its lower surface submerged below the chassis.

According to the first aspect of the present invention, the member (for example, engine or fuel tank) can be arranged with the center of gravity lowered by providing the member support portions at the front, rear, or both front and rear sides of the mission case. For this reason, the center of gravity of the traveling vehicle body can be lowered to improve traveling stability. The traveling vehicle body can also be called a traveling unit.

The engine has a considerable weight, and its height position affects the center of gravity of the traveling vehicle body. Accordingly, when the engine is supported by the front member support portion as in the second aspect of the invention, the engine is disposed in a state where it is sunk below the chassis, so that it is ensured that the center of gravity of the traveling vehicle body is lowered. Therefore, it is very useful for improving running stability. Which member is supported by the member support portion can be selected according to the type and structure of the work machine.

Since Patent Document 2 tilts the front part of the side frame, it can be applied only to the type in which the engine is arranged in the front part of the chassis. However, in this application, as specified in the eleventh invention, the engine support is provided. It is also possible to place it behind the mission case. In other words, it is possible to employ the engine support of the second invention as the rear member support portion. ). Therefore, in the present invention, it can be said that the flexibility of the arrangement position of the engine is high.

Further, in Patent Document 2, in order to reduce the support height of the engine, it is necessary to cope with the inclination angle of the frame (chassis) or the total length of the inclined portion, but in the third invention of the present application, Since the engine support is connected to the chassis, the engine support can be designed without being restricted by the chassis, and therefore the height to support the engine can be set arbitrarily without being restricted by the chassis. can do.

Further, in the third invention of the present application, since the chassis does not need to be greatly modified to provide the engine support, it is not necessary to greatly change the support structure of the other members. Therefore, the engine support is provided. Therefore, it is possible to prevent or suppress increase in design cost and manufacturing cost.

In the configuration of the third aspect of the invention, the engine support has a frame structure that is open at the front and back, and the lower part of the engine has an open structure that hits the wind. As a result, the cooling performance can be improved. In addition, since the engine support also serves as a frame reinforcement that connects the left and right side frames, it can contribute to the improvement of the rigidity of the chassis.

The engine support can be made in various forms and structures, for example, made of sheet metal. However, if a U-shaped support frame is used as in the fourth aspect of the invention, there is an advantage that the engine can be firmly supported with a simple structure. is there.

In the case of the fourth invention, the engine can be secured by supporting it from both the front and rear sides. Therefore, it is preferable to arrange a plurality of support frames at the front and back, but a plurality of support frames are provided at the front and rear as in the fifth invention. When the two are connected by a reinforcing body, it is preferable that the rigidity of the support frame can be remarkably improved while firmly securing the support function of the engine. In the configuration of the fifth aspect of the invention, since the reinforcing body protrudes below the support frame, the reinforcing body also serves as a guard for protecting the engine, which is excellent in terms of safety.

In the sixth aspect of the invention, the mission case and the rear axle case can be used as strength members of the traveling aircraft. For this reason, the traveling vehicle body can ensure robustness while reducing the weight. The lower connecting body can support, for example, a member or device such as a fuel tank, but since the lower connecting body is located below the upper surface of the transmission case, the supported member can be arranged as low as possible. As a result, it is possible to contribute to improving the stability and compactness of the traveling vehicle body.

In the seventh invention, since the side frame or the mid frame and the lower connecting body are connected to each other, the chassis and the lower structural body reinforce each other, and as a result, the traveling machine body can ensure a remarkably high rigidity. Therefore, for example, even a large rice transplanter such as 8-row planting or 10-row planting can ensure high robustness. In addition, 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. Thus, the advantage of securing the robustness can be exhibited without providing a member support portion. Therefore, it may be an independent invention to connect the chassis and the lower connecting body with the reinforcing body.

As described above, in the riding type rice transplanter, the link mechanism is rotated by the hydraulic cylinder to raise and lower the seedling planting device. However, naturally, a large load is applied to the hydraulic cylinder. When the cylinder is connected to the lower connecting body, a large bending load acts on the lower connecting body. However, in the seventh invention of the present application, since the chassis and the lower coupling body are coupled by the reinforcing body, the resistance force of the lower coupling body against the bending force can be remarkably improved. For this reason, the cylinder is attached. Even in this case, high strength can be ensured.

Adopting the eighth aspect of the invention has the advantage that the fuel tank can be increased in capacity because the fuel tank can be placed in a state of being submerged below the chassis.

Various materials such as plate and steel can be used for the reinforcing body, and the form can be developed in various ways. However, if the ninth invention is adopted, the reinforcing body can be easily manufactured by bending a steel pipe, so the cost can be reduced. Excellent in terms. Further, the loads acting on the left and right front wheels and the left and right rear wheels of the traveling machine body are usually different depending on road conditions and the like, and the torsional force acts on the traveling machine body due to such uneven load. In many cases, however, in the ninth invention, the reinforcing body has a bilaterally symmetrical shape, so that the traveling machine body can exert a strong strength against torsion.

When the tenth invention is adopted, the front end of the rear side frame is supported by the reinforcing body in the vicinity immediately below, so that the reinforcing function of the reinforcing body is more accurately exhibited, which is more suitable for increasing the strength.

It is a figure which shows embodiment, and is the whole rice transplanter in the state which removed the vehicle body cover. (A) is a plan view of the whole rice transplanter, and (B) is a perspective view of the traveling vehicle body as viewed from the side. (A) (B) is a perspective view which shows the framework of a traveling vehicle body. It is a partial separation perspective view of a traveling body. (A) is a perspective view of the traveling vehicle body from which the engine is separated, and (B) is a schematic side view of the main part. It is a separation perspective view showing a support structure of an engine. It is a figure which shows the support structure of an engine, (A) is a separate perspective view of an engine and a support member, (B) is a separate perspective view of a support unit, (C) is a perspective view of a buffer unit. (A) is a side view of the front portion of the traveling vehicle body, and (B) is a partial front view of the traveling vehicle body. (A) is a partial top view of the front part of a traveling vehicle body. It is a top view of the modification in the state where a part of member was omitted. (A) is an exploded perspective view of the main part, (B) is a perspective view showing a connection state between the lower connecting body and the transmission case, and (C) is a perspective view showing a connection state between the lower connecting body and the rear axle case. is there. (A) is the isolation | separation side view of the principal part, (B) is a perspective view from the lower part which shows 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. FIG. 7A is a diagram illustrating a modification, in which FIG. 7A is a separated perspective view, FIG. 5B is a separated side view, and FIG. It is a figure which shows other embodiment, (A) is a side view, (B) is a perspective view. It is the isolation | separation perspective view which shows other embodiment. It is a schematic side view which shows other embodiment.

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 opposite to 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 2, the rice transplanter has a traveling vehicle body 1 and a seedling planting part 2 as basic elements, and the seedling planting part 2 can be raised and lowered to the rear part of the traveling vehicle body 1 via a link device 3. It is connected to. The seedling planting part 2 can be detachable from the link device 3 or can be non-detachable.

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. The rear wheel 5 can be configured in a double system or a triple system with an auxiliary wheel. The traveling vehicle body 1 further 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 arranged at the left and right intermediate positions of the traveling vehicle body 1. Preliminary seedling stands 8 (see FIG. 2) are arranged in front of the seat 6 and on the left and right sides. In FIG. 2, the preliminary seedling stand 8 displays only a framework.

For example, as generally understood from FIGS. 3 to 5, the traveling vehicle body 1 includes left and right front side frames 9 and a rear side frame 10 extending 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 tilted 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 (round steel pipes), and the other frames use square pipes (square steel pipes).

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 substantially U-shaped hanger bracket 18 (see FIGS. 4 and 5) when viewed from the front. 18 is welded to the rear side frame 10.

A gate-type (reverse U-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 (see FIG. 1) is fixed to the gate-type frame 19. ing. The rear part of the seat support unit 20 is fixed to a stay (not shown). A fuel tank 21 is disposed below the seat 6, and the fuel tank 21 can be lubricated when the seat 6 is tilted forward and rotated.

The front side frame 9 is fixed with a plurality of outward branch frames 15 protruding outward in the left and right directions, and the branch seed frame 15 supports the preliminary seedling stand 8. A longitudinal auxiliary frame 23 is disposed outside the side frames 9 and 10, and the auxiliary frame 23 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 configured by frame materials such as the front and rear side frames 9 and 10, the mid frame 11, the front frame 12, and the rear frame 13. As shown in FIG. 2, a portion of the traveling vehicle body 1 on which a person is placed is covered with a vehicle body cover 24, and the vehicle body cover 24 includes a front side frame 9, a branch frame 15, an auxiliary frame 23, a rear horizontal stay 17, It is supported by the rear frame 13 and the like. Although a fertilizer is often arranged behind the seat 6, the illustration is omitted in this embodiment.

The steering handle 7 is attached to a handle shaft built in the handle post 25. As shown in FIG. 2, a portion of the vehicle body cover 24 between the seat 6 and the handle post 25 is a control floor 24a on which a person stands or puts his / her foot in a seated state, in front of the control floor 24a. The engine 26 is disposed on the side (the support structure of the engine 26 will be described later). The engine 26 is covered from the front and rear by a hood.

For example, as shown in FIG. 5, behind the engine 26, a mission case 27 incorporating a gear group is arranged. For example, as shown in FIG. 3, an HST (hydrostatic hydraulic continuously variable transmission) 28 as an example of a continuously variable transmission is attached to the left side surface of the mission case 27, and the power of the engine 26 is primarily HST 28. Is transmitted to the belt 29 and then to the gear group. In addition to the gear group, the transmission case 27 includes a clutch, a brake, and the like. However, the description is omitted because it is not directly related to the present invention.

For example, as shown in FIG. 5, a tension pulley 30 is in contact with the belt 29 from below. The tension pulley 30 is attached to the tip of the rotary arm 31. A power steering unit 32 is attached to the front portion of the mission case 27, and a handle post 25 is fixed to the power steering unit 32.

For example, as shown in FIG. 3, the front axle device 33 is attached to the left and right side surfaces of the mission case 27, and the front wheel 4 is attached to the front axle device 33. 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.

As can be understood from FIGS. 3 to 5, the rear end of the transmission case 27 and the front end of the rear axle case 34 are connected by a lower connecting body (joint) 36 made of a round pipe, and the lower connecting body 36 and the midframe 11 are connected. Are connected by a U-shaped reinforcing frame 37 as viewed from the front as an example of a reinforcing body. The fuel tank 21 is disposed between the lower connecting body 36 and the seat 6, and the fuel tank 21 is supported by the lower connecting body 36 via a receiving member 38. The receiving material can also be called a rear support.

As shown in FIGS. 3 and 4, the lower connecting body 36 is connected via a bracket 40 so that an elevating cylinder (hydraulic cylinder) 39 tilted backward as viewed from the side rotates around its front end. ing. The link device 3 shown in FIG. 1 is rotated by the expansion and contraction of the elevating cylinder 39, and the seedling planting unit 2 is raised and lowered accordingly.

For example, as shown in FIG. 3, a rear wheel drive shaft 41 is disposed on the left side of the lower coupling body 36, and a work power shaft 42 is disposed on the right side. Of course, the rear wheel 5 rotates in synchronization with the front wheel 4. When the leveling rotor is provided, the leveling rotor is driven by the rear wheel drive shaft 41. The seedling planting unit 2 is driven by the work power shaft 42 (if a fertilizer is provided, this is also driven by the work power shaft 42). The work power shaft 42 transmits power to the seedling planting part 2 via the inter-strain adjustment device 43.

(2). Engine and its supporting structure Next, the engine 26 will be described. The engine 26 of the present embodiment is a water-cooled diesel engine, and is arranged in a horizontally placed posture with the crankshaft being horizontally long. The engine 26 basically has the same configuration as that of the prior art. For example, as can be easily understood from FIG. 6, as major elements, an engine body 44 including a crankcase, a cylinder block, and a cylinder head, It has a radiator 45 arranged on the right side.

As clearly shown in FIG. 6, the output shaft (crank shaft) 48 of the engine 26 protrudes from the left side surface of the engine body 44, and a flywheel 49 and an output pulley 50 are fixed to the output shaft 48. Power is transmitted to the above-described HST 28 by the belt 29 wound around the output pulley 50 (see FIGS. 1, 4, 5, and 10).

音 A silencer 51 is arranged on the left side of the flywheel 49. The silencer 51 is disposed between the front side frame 9 and the auxiliary frame 23 in a plan view, and is suspended by a stay 52 fixed to the front side frame 9 and the auxiliary frame 23. The silencer 51 is covered with a cover 53 (see FIG. 9).

For example, as shown in FIG. 5, a disc 54 located inside the flywheel 49 is fixed to the left side surface portion of the engine body 44, and the rotary arm 31 to which the tension pulley 50 is attached is interposed via a bracket. And attached to the disk 54.

As clearly shown in FIGS. 5 and 6, a support frame 55 is connected to substantially the front half of the left and right front side frames 9, and the engine main body 44 of the engine 26 is supported by the support frame 55. The support frame 55 is formed of a round pipe (round steel pipe), and has a horizontally long U-shape in front view having left and right vertical portions (longitudinal portions) and a lower horizontal portion connected to the lower ends thereof, and the left and right front sides. It is attached to the frame 9 in a suspended state. The support frame 55 can also be called a front support.

The front and rear support frames 55 are connected by frame reinforcing bodies (connection frames) 56 at the left and right intermediate portions thereof, and the engine support (front side member support portion) described in the claims is formed by the support frames 55 and the frame reinforcement bodies 56. It is configured. The frame reinforcing body 56 is bent downward in a side view and protrudes below the support frame 55. Therefore, the frame reinforcement 56 also serves as a guard function for the engine 26.

A side bracket 57 is fixed to the right side of the front and rear support frame 55, and the radiator 45 is supported by the side bracket 57. The radiator 45 is supported by the side bracket 57 via a cushioning material such as rubber. The side bracket 57 has a longitudinally long base portion and an inwardly projecting portion that projects laterally from both front and rear ends. Although the support frame 55 is welded to the lower surface of the front side frame 9, it can be welded or bolted to the inner surface or the outer surface of the front side frame 9. Needless to say, the support frame 55 may be fixed to the front side frame 9 via a bracket.

A pair of left and right lower brackets 59 that support the engine 26 are fixed to the lower horizontal portion of the front and rear support frame 55 by welding. The front lower bracket 59 extends forward from the front support frame 55, the rear lower bracket 59 extends rearward from the rear support frame 55, and each lower bracket 59 has a high tip. It is inclined with respect to the horizontal. Accordingly, the front and rear lower brackets 59 have an inclined posture in which the interval is narrowed downward as viewed from the side.

On the other hand, as clearly shown in FIG. 7, left and right horizontally long upper brackets 60 are fixed to the front and rear surfaces of the lower part of the engine body 44 by bolts 61, respectively. The upper bracket 60 has a substantially L-shaped cross section, and support pieces 60a extending in parallel with the lower bracket 59 are provided at both left and right ends thereof, and the vibration absorbing unit 62 is provided between the support piece 60a and the lower bracket 59. Intervene.

The vibration absorption unit 62 has a structure in which a cushioning material 65 such as rubber is sandwiched between an upper plate 63 and a lower plate 64, and a bolt 66 is attached to the upper plate 63, the lower plate 64, and the cushioning material 65. And the upper bracket 60 and the lower bracket 59 are fastened by screwing the nut 67 into the bolt 66.

Side plates

63 a and 64 a that also serve as reinforcements are formed by bending the upper plate 63 and the lower plate 54 of the vibration absorbing unit 62. The bolt 66 may be fixed to one of the upper plate 63 and the lower plate 64, or may simply be passed through both.

The support piece 60a of the upper bracket 60 has a round hole 68 into which the bolt 66 of the vibration absorbing unit 62 is fitted, while the lower bracket 59 is formed with a slot 69 for fitting the bolt 66 of the vibration absorbing unit 62 into the opening. ing. Although it is possible to make a round hole in the lower bracket 59, if the method of forming the slot 69 and fitting the bolt 66 from the front or the rear as in this embodiment is adopted, the assembly work of the engine 26 is facilitated. There is an advantage that can be done.

In the embodiment, the opening of the slot 69 extends in a tapered shape, so that the bolt 66 can be easily fitted. In addition, when the front and rear lower brackets 59 are inclined such that the distance between the front and rear lower brackets 59 decreases downward as viewed from the side, the engine 26 tends to be held between the front and rear lower brackets 59 by its own weight. , Excellent posture holding function.

As shown in FIG. 6, a rear bracket 70 projecting rearward is connected to a substantially right and left intermediate portion of the support frame 55 on the rear side. As shown in FIG. 6, a pin 71 passes through the tip of the rear bracket 70, and the rear bracket 70 is connected to the mission case 27 by this pin 71. Therefore, in this embodiment, the mission case 27 also serves as the structural material (strength member) of the traveling vehicle body 1.

That is, in the present embodiment, the chassis is configured by frame materials such as the front and rear side frames 9 and 10, the front frame 12, the mid frame 11, the rear frame 13, and the rear column 14, and these chassis and the transmission case 27, The lower connecting body 36 and the rear axle case 34 cooperate to form the framework of the traveling vehicle body 1.

(3) Summary In the above configuration, the engine 26 is in a state of sinking below the lower surface of the front side frame 9 and in a state of sinking below the upper surface of the mission case 27. Thus, since it is supported by the support frame 55 in a state of sinking downward, the center of gravity of the traveling vehicle body 1 can be lowered to improve traveling stability.

Since the front side frame 9 may remain in a horizontal position, the outer branch frame 15 is fixed to the front side frame 9 to support the vehicle body cover 24 and the spare seedling stand 8. It is only necessary to adopt a simple support structure such as fixing. Therefore, it is possible to prevent the configuration around the engine 26 from becoming complicated due to the lowering of the engine 26.

When the engine 26 is supported by the support frame 55 fixed to the front side frame 9 as in the present embodiment, the space surrounded by the front frame 12 and the left and right front side frames 9 becomes the arrangement space of the engine 26. Therefore, the front frame 12 and the left and right front side frames 9 substantially function as a guard for the engine 26. In this respect, it can be said that this is an advantage of the present embodiment.

The engine 26 can be arranged vertically with the crankshaft extending in the front-rear direction. However, the engine 26 is generally elongated in the axial direction of the crankshaft. There is a possibility that the total length becomes longer. On the other hand, when the engine 26 is arranged horizontally as in the present embodiment, there is an advantage that it is possible to suppress the traveling vehicle body 1 from becoming long. Further, power transmission to the transmission can be easily performed by the belt 29.

Further, when the power of the engine 26 is transmitted to the transmission case 27 (HST 28) by the belt 29, an external force that attracts the belt 26 is applied to the engine 26 and the transmission case 27. In this embodiment, the rear support is provided. Since the frame 55 and the mission case 27 are connected via the rear bracket 70 and the distance between the support frame 55 and the mission case 27 is kept constant, the support frame 55 may be pulled backward. As a result, external force does not act, and as a result, the positional relationship between the engine 26 and the mission case 27 can be firmly held, and the fixing strength of the support frame 55 with respect to the front side frame 9 can be secured.

The side bracket 57 on which the radiator 45 is placed can be fixed to the front side frame 9. However, when the side bracket 57 is fixed to the front and rear support frames 55 as in this embodiment, the side bracket 57 fixes the front and rear support frames 55. Since the body is also used, there is an advantage that the robustness of the engine support structure mainly composed of the support frame 55 is remarkably improved.

(4) Cooling of the silencer Now, the silencer 51 of the engine 26 is heated to high temperature by the exhaust gas, so it is preferable to cool it if possible. However, the actual situation is that no contrivance for cooling the silencer 51 has been made. As a matter of fact, providing a fan or a duct for cooling the silencer 51 has a large cost demerit.

On the other hand, in the present embodiment, the silencer 51 can be cooled in a state in which the cost increase is suppressed. That is, utilizing the fact that the silencer 51 is arranged beside the flywheel 49, a cooling fan 72 is fixed to the outer surface of the flywheel 49 as schematically shown in FIG. The silencer 51 is cooled by the wind of the fan 72.

Since the cooling fan 72 is simply fixed to the outer surface of the flywheel 49 as described above, the cost does not increase significantly. It is also possible to integrally form the blowing fins on the flywheel 49. The silencer 51 may have an afterburner function or an exhaust gas purification function.

(5). Structure of the latter half of the traveling vehicle body Next, the details of the portion of the traveling vehicle body 1 on the rear side of the transmission case 27 will be described. First, the connection structure between the lower connecting body 36 and the transmission case 27 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 74 is fixed to the front end of the lower connection body 36 by welding and is fastened to the rear surface of the transmission case 27 with the bolt 74 ′, and the rear support plate 75 is welded to the rear end of the lower connection body 36. The rear support plate 75 is fastened to the front surface of the rear axle case 34 with bolts 75 ′.

The

support plates

74 and 75 are rectangular, but any shape can be selected as necessary. As shown in FIG. 15, a male fitting portion 36 a that projects forward of the front support plate 74 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 mission case 27. 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.

Reinforcing frame 37 is manufactured with a round pipe (round steel pipe). The reinforcing frame 37 will be described next. For example, as shown in FIG. 12, the mission case 27 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 27. More specifically, the gear group is arranged in the mission case 27 with the height changed vertically, and therefore the mission case 27 has a considerably large vertical dimension.

The lower coupling body 36 is fixed to the lower end portion of the mission case 27. Therefore, the lower coupling body 36 is arranged considerably below the front side frame 9 and the mid frame 11, and the rear wheel drive shaft 41 is It is connected to the rear axle case 34 in a posture substantially parallel to the lower coupling body 36 in a side view.

Further, the reinforcing frame 37 is in a forward inclined posture in a side view so that the height is lowered as it goes downward, and the upper left and right ends are fixed to the mid frame 11 by welding. Further, as clearly shown in FIG. 16A, a receiving member 38 having a downward opening groove shape having left and right downward pieces 38 a is fixed to the bottom portion 37 a of the reinforcing frame 37, while The support bracket 77 fitted so as to cover the receiving member 38 is fixed, and the receiving member 38 and the support bracket 77 are connected by the horizontally long pins 78. It should be noted that bolts and nuts may be used instead of the pins 78 and fastened with them, or the reinforcing frame 37 may be fixed to the lower coupling body 36 by welding.

The receiving member 38 is provided with a pair of left and right rubber seats 79 that support the lower surface of the fuel tank 21. As shown in FIG. 16A, a downward bulging portion 21a is provided in front of the support portion by the rubber seat 79 on the lower surface of the fuel tank 21, and a fuel outlet 80 is provided in the downward bulging portion 21a. The fuel is sent from the outlet 80 to the engine 26 through a filter (not shown). Since the engine 26 is a diesel system and the fuel is forcibly sent by a pump, the outlet 70 of the fuel tank 21 may be below the engine 26.

As clearly shown in FIG. 12B, the fuel tank 21 is provided with a pair of front and

rear flanges

81 and 82, and the front flange 81 is fixed to a tank bracket 83 fixed to the midframe 11 with screws. . On the other hand, the rear flange 82 of the fuel tank 21 is fastened to the bracket plate 18a provided on the hanger bracket 18 shown in FIGS. The fuel injection port 84 of the fuel tank 21 is located below the seat 6, and when the seat 6 is tilted forward, the oil injection port 54 is exposed.

For example, as can be understood well from FIG. 12B, a stepped portion 85 is formed on the upper surface of the fuel tank 21 so as to open on the left side and on the front side. For example, a hydraulic unit 86 can be arranged at the stepped portion 85. Hydraulic equipment such as the hydraulic cylinder 39 is controlled by the hydraulic unit 86. Of course, another member may be disposed at the position of the step portion 85, or the step portion 85 may not be provided.

(6) Link mechanism / hydraulic cylinder Next, the link mechanism 3 and the hydraulic cylinder 39 will be described. As shown in FIGS. 17 and 18, the link mechanism 3 has a top link 88 and a lower link 89 that are divided into upper and lower parts, and a first pin 90 and The hitch 92 is connected to the second pin 91 so as to be relatively rotatable. A king pin (not shown) protrudes rearward from the lower end of the hitch 92, and the seedling planting part 2 is connected via the king pin. Therefore, the seedling planting part 2 can roll at a certain angle with respect to the traveling machine body 1.

The top link 88 is composed of each pipe or channel material and is basically in a straight line form. An upper bearing cylinder 93 is fixed to the front end of the top link 88 and the upper bearing cylinder 93 is fixed to the left and right rear columns 14. The shaft 94 is fitted. Accordingly, the top link 88 is connected to the rear column 14 so as to rotate up and down around its front end. The upper support shaft 94 has a cylindrical shape, and a third pin 95 is fitted therein.

The lower link 89 is substantially Y-shaped with one front portion and branched backward, and a lower bearing tube 96 is fixed to the front end, and this is fitted to a lower support shaft 97 fixed to the rear column 14, Accordingly, the lower link 89 is also connected to the rear column 14 so as to rotate up and down around its front end. The lower support shaft 97 is also cylindrical and has a fourth pin 98 fitted therein.

The lower link 89 is connected by a fifth pin 100 so that a longitudinally long intermediate link 99 rotates around its rear end. The intermediate link 99 is in the form of a downward opening groove, and a hollow sixth pin 101 is inserted through the front end of the intermediate link 99. On the other hand, a pair of left and right arms 102 project upward from the front end portion of the lower link 89, and the left and right arms 102 support the sixth pin 101 from below.

On the other hand, the hydraulic cylinder 39 has a cylindrical body 39a and a piston rod 39b, and the proximal end of the cylindrical body 39a is connected to a bracket 40 fixed to the lower connecting body 36 by a seventh pin 104, while the piston rod For example, as shown in FIG. 17, a plate-like hook 105 with a round hole is fixed to the tip of 39b, and the hook 105 and the intermediate link 99 are connected by the previously described sixth pin 101 (see FIGS. 17 and 18). Has been.

Therefore, when the hydraulic cylinder 39 is extended, the link device 3 is rotated downward and the seedling part 2 is lowered, and when the hydraulic cylinder 39 is contracted, the link device 3 is rotated upward and the seedling part 2 is raised. A buffering accumulator 106 is provided at the tip of the cylinder portion 39a of the hydraulic cylinder 39 to reduce the impact. The hydraulic cylinder 39 may be directly connected to the arm 102 without using the intermediate link 99.

(7) Summary of the latter half of the traveling vehicle body As described above, in the present embodiment, the transmission case 27 and the rear axle case 34 also serve as the structural material of the traveling vehicle body 1, and accordingly, the structure of the traveling vehicle body 1 is increased accordingly. This simplifies and contributes to cost reduction and weight reduction (the mission case 27 and the rear axle case 34 have a sturdy structure because of their functions, so that they can sufficiently function as strength members). Since the lower connecting body 36 and the mid frame 11 are connected by the reinforcing frame 37, the lower structure including the mission case 27 and the chassis including the side frames 9 and 10 and the like are reinforced with each other. As a result, the overall structure is extremely sturdy.

Now, the load of the seedling planting part 2 acts on the hydraulic cylinder 39 as a tensile force, and a bending force acts on the lower coupling body 36 by this tensile force. Thus, since the reinforcing frame 37 is stretched from the upper side to the lower connecting body 36, the bending deformation of the lower structure including the lower connecting body 36 and the transmission case 27 can be remarkably suppressed, and as a result, high durability. Can be secured.

The fuel tank 21 is surrounded by the reinforcing frame 37, so that the height of the fuel tank 21 can be made as low as possible regardless of the presence of the reinforcing frame 37. Further, in this embodiment, since the receiving member 38 for connecting the reinforcing frame 37 is also used as the support member of the fuel tank 21, there is an advantage that the structure can be simplified accordingly. Further, for example, as shown in FIG. 12A, a recess 107 for allowing the movement of the hydraulic cylinder 39 is formed on the lower surface of the fuel tank 21, so that the function of the hydraulic cylinder 39 is impaired. The fuel tank 21 can be made as low as possible. This is also one of the advantages of this embodiment.

In the present embodiment, the front side frame 9 and the rear side frame are separated by separating the side frame into the front side frame 9 and the rear side frame 10 and connecting the front and rear side frames 9 and 10 with the mid frame 11. The size (thickness) of 10 and the position / posture can be easily changed. This is one of the advantages of this embodiment.

In the present embodiment, the rear column 14 is supported by the cross beam member 35 fixed to the rear axle case 34. 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.

(8). Further reinforcement structure There are irregularities both on the field and on the road. For this reason, the four

wheels

4 and 5 are supported (for example, one wheel is in a floating state). Therefore, the weight of the vehicle body 1 may act as an external force twisting around the longitudinal longitudinal axis. In this regard, when the reinforcing frame 37 is provided as in the embodiment, the rigidity of the structure constituted by the chassis, the transmission case 27, the lower coupling body 36, the rear axle case 34, and the rear column 27 is significantly increased. Therefore, the resistance to torsion can be significantly improved.

Then, as clearly shown in FIG. 19, in this embodiment, a reinforcing function is provided so that the rigidity against torsion can be further improved. That is, the left and right sides of the reinforcing frame 37 are connected by the longitudinal longitudinal reinforcing stays 113, and the reinforcing frame 37, the left and right reinforcing stays 113, and the rear axle case 34 constitute a substantially rectangular frame in plan view. (Naturally, the strength against bending is also improved.)

The reinforcing stay 113 uses a square steel pipe, and a front auxiliary bracket 114 having an outward opening groove shape is welded to the front end portion thereof. On the other hand, a substantially L-shaped support bracket 115 in plan view is welded to the left and right sides of the reinforcing frame 37, and the front auxiliary bracket 114 and the support bracket 115 are fastened by a plurality of bolts 116 and nuts 117. .

Also, a rear auxiliary bracket 118 in a side view is welded to the rear end of the reinforcing stay 113, and the rear auxiliary bracket 118 is fixed to the front side surface of the rear axle case 34 with a bolt 119. A receiving seat 120 into which a bolt 119 is screwed is provided on the front side surface of the rear axle case 34. The receiving seats 120 are formed in pairs on the front and rear sides, and when higher strength is required, the auxiliary bracket 118 may be spread back and fastened to the four receiving seats 120 as indicated by a one-dot chain line.

(9). Other Embodiments In the embodiment shown in FIG. 20, in the support mechanism of the engine 26, the frame reinforcing body 56 is made of sheet metal, and a plurality of through holes 56 a having upper and lower openings are formed in the frame reinforcing body 56. In this embodiment, since the plane area of the frame reinforcement 56 is large, the rigid body against torsion is high and the guard function of the engine 26 is also high. In addition, the presence of the through hole 56a can reduce the weight and ensure the ventilation function.

Further, in the embodiment of FIG. 20, a bumper 122 having a U-shaped opening facing backward in plan view is disposed in front of the support frame 55 on the front side. The bumper 122 is inclined in a side view so as to increase in height as it goes forward, its left and right rear ends are welded to the front support frame 55, and the front end of the bumper 122 is front to the front frame 12. It is connected via a bracket 123.

Now, the conventional bumper is merely a horizontally long form and is only fixed to the front frame. That is, the conventional bumper only has a guard function at the front end of the traveling vehicle body, and does not have other functions.

On the other hand, in the present embodiment, the bumper 123, the front frame 12, and the front support frame 55 are connected to each other, so that the robustness of the front portion of the chassis is remarkably increased. That is, the bumper 123 has a function of reinforcing the chassis (traveling vehicle body).

Further, since the bumper 122 is fixed to the front support frame 55, it also functions as a protective member for the engine 26. For this reason, the engine 26 is disposed in a state where it is sunk below the front side frame 9. Although it is the configuration, the protection function of the engine 26 can be further improved (the ventilation function is not hindered, so the cooling function of the engine 26 is also high). In this embodiment, a hydraulic unit 86 is attached to the upper rear surface of the mission case 27 as shown in FIG.

FIG. 21 shows another example of the entire framework. In this embodiment, two outer and inner outer frames 124 are disposed outside the auxiliary frame 23, and the outer frame 124 is supported by a plurality of front and rear outer brackets 125. The auxiliary cover 126 is supported by the outer frame 124. The elevating step 128 is also fixed to the outer outer frame 124. The vehicle body cover 24 has a shoulder portion 24b with a raised rear portion, and a surrounding frame (safety fence) 127 is disposed around the step portion 24b. The left and right surrounding frames 127 are fixed to the outer outer frame 124.

The outer frame 124 is arranged in a state of projecting greatly to the left and right outer sides of the side frames 9 and 10. Therefore, a pair of left and right connecting rods 128 extending from the lower connecting body 36 to the left and right outer sides are provided, and the outer bracket 125 positioned at the rear end is supported by the connecting rod 128. For this reason, the robustness of the site | part which a person mounts can be improved significantly. The support rod 128 is connected to a bracket fixed to the lower connecting body 36.

In the embodiment shown in FIG. 22, the engine 26 is arranged behind the mission case 27. In this embodiment, the mission case 27 and the rear axle case 34 are connected by a lower connecting body 36 as in the previous embodiment, and have a front reinforcing body 37 and a rear reinforcing body 37 '. The rear reinforcing member 37 ′ is fixed to a horizontally long frame 130 connected to the left and right rear side frames 10. The reinforcing bodies 37 and 37 'are attached to the lower connecting body 36 via a bracket, but may be directly attached by welding or bolting.

A bottom plate 131 is attached to the front and rear reinforcing bodies 37 and 37 ', and the engine 26 is supported by the bottom plate 131 through vibration-proof rubber (not shown). The front and rear reinforcing bodies 37, 37 'are U-shaped when viewed from the front. In the present embodiment, the fuel tank can be disposed in front of the mission case 27.

It is also possible to form the front and rear reinforcing bodies 37, 37 'in a substantially L shape in front view having a vertically long lower horizontal portion, and to fix the tip of the lower horizontal portion to the side surface of the lower connecting body 36. It is also possible to fix the lower horizontal portion of the reinforcing

bodies

37 and 37 ′ formed in a U shape in front view to the lower surface of the lower coupling body 36. The front reinforcing body 37 may be fixed to a portion of the mid frame 11 outside the rear side frame 10.

(10). Others The present invention can be embodied in various ways other than the above embodiment. For example, the application target is not limited to the riding type rice transplanter, but can be applied to various farming machines such as a seedling transplanter and a lawn mower. It is also possible to replace the seedling planting part of the embodiment with another working device 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.

サイド The side frame does not need to be divided into separate front and rear parts, and the whole may be connected to one. The form of the reinforcing body connected to the midframe and the lower connecting body is not limited, and various forms can be adopted. Many variations can be adopted, such as making the lower connection body round pipes or using multiple pipes. 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. 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 demonstrates its usefulness. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Traveling vehicle body 2 Seedling planting part as an example of working device 3 Link device 4 Front wheel 5 Rear wheel 9 Front side frame 11 Mid frame 12 Front frame 13 Rear frame 21 Fuel tank 24 Car body cover 24a Control floor 26 Engine 27 Mission case 38 Receiving portion 39 as an example of a rear member support portion 39 Hydraulic cylinder 55 Support frame constituting an engine support as an example of a front member support portion 56 Frame reinforcing body constituting an engine support

Claims

The vehicle has a traveling vehicle body on which a person is placed and steered, and an engine mounted on the traveling vehicle body. The traveling vehicle body has a chassis and a traveling mission case disposed below the cockpit, and the chassis is a frame. It is made of material, and power is transmitted from the engine to the inside of the traveling mission case.
The structure
The chassis and the mission case are arranged in a state where the mission case is positioned below the chassis, and the members positioned below the upper surface of the mission case at the front, rear, or both front and rear portions of the mission case. Provided with a support,
Riding type farm work machine.
An engine support on which the engine is mounted as a front member support portion located in front of the mission case at a position in front of the mission case in the chassis, and a lower end of the engine support below the upper surface of the mission case. Projecting downward in the position, the engine is supported by the engine support with its lower surface submerged below the chassis,
The riding type agricultural working machine according to claim 1.
The chassis has a structure in which left and right side frames extending in the front-rear direction are connected by a horizontally long frame, and the engine support is provided at a front portion of the left and right side frames.
The riding type agricultural machine according to claim 2.
The engine support includes one or a plurality of support frames having a U-shaped configuration with an upward opening when viewed from the front, and the engine is attached to the bottom of the support frame via a buffer.
The riding type agricultural working machine according to claim 3.
A plurality of the support frames are arranged side by side in front and rear, and the plurality of support frames are connected by one or a plurality of frame reinforcements protruding below the support frame.
The riding type agricultural machine according to claim 4.
A front axle device that supports a front wheel is connected to the transmission case, and a rear axle case that rotatably supports a rear wheel is disposed behind the transmission case, the transmission case and the rear axle case, Is connected by a lower connecting body located below the upper surface of the mission case, and the lower connecting body is provided with a rear side member support portion located behind the mission case.
The riding type agricultural working machine according to claim 1.
The chassis includes left and right side frames extending in the front-rear direction, left and right laterally middle frames that connect the left and right side frames at a middle part in the front and rear, and left and right laterally long rear frames that connect the left and right side frames at a rear end thereof. The rear frame is supported by a rear axle case via a rear column,
And the mid frame or the left and right side frames and the lower connecting body are connected by a reinforcing body,
The riding type agricultural working machine according to claim 6.
The reinforcing body is U-shaped upward in a front view and is inclined forward in a side view so as to become lower toward the rear, and a fuel tank is supported by a rear member support provided at the bottom of the reinforcing body is doing,
The riding type agricultural machine according to claim 7.
The reinforcing body is made of a steel pipe and has a frame structure, and the reinforcing body has a substantially U-shaped or substantially V-shaped form in a front view.
The riding type agricultural machine according to claim 7.
The side frame is divided into a substantially horizontal posture front side frame located in front of the mid frame and a rear side frame that is located behind the mid frame and is inclined so as to increase backward. The rear side frame is fixed to the mid frame on the left and right inner sides of the front side frame, while the reinforcing body is fixed to the mid frame in the vicinity of the front end of the rear side frame.
The riding type agricultural machine according to claim 7.
As a rear member support portion disposed behind the mission case, an engine support on which the engine is mounted is disposed in a state where a lower end of the engine support is located below the upper surface of the mission case, It is supported by the engine support with its lower surface submerged below the chassis,
The riding type agricultural working machine according to claim 1.