JP5508624B2 - Riding machine - Google Patents

Description

  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 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 such as steel pipes and channel materials, and generally has left and right side frames that extend long in the front-rear direction as the main members of the frame. The left and right side frames are connected by a horizontally long member. A link device is connected to the seedling planting device and the traveling 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.

Japanese Patent No. 4139669 JP 2000-201510 A

  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 regard, Patent Document 2 can reduce the mounting height of the engine, which can contribute to lowering the center of gravity of the traveling vehicle body. 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 vehicle body cover is almost always arranged in a state of extending to both the left and right sides of the engine. The part of the 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 support structure of the vehicle body cover is also changed. This must increase design and manufacturing costs.

  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 been made to improve the current situation.

The riding type agricultural working machine according to the present invention includes a traveling vehicle body (1) on which a person rides and steers and an engine (26) mounted thereon, and the traveling vehicle body (1) extends in the front-rear direction. The left and right side frames (9) and (10) have a chassis having a structure in which the horizontally long frames (11), (12), and (13) are connected to each other, and the front portions of the left and right side frames (9) and (10) In addition, two front and rear support frames (55) having a U-shaped or U-shaped shape in an upward opening in a front view are provided so as to protrude downward, and at the bottoms of both the support frames (55), The engine (26) is supported in an anti-vibration manner through a plurality of vibration absorbing units (62), and the lower surface of the engine body (44) of the engine (26) is sandwiched between the support frames (55). not have, said both support Over preparative frame (55) is made of round pipe, is that form in front view a U-shaped or oblong U-shaped having a lower horizontal portion which is connected with its lower end left and right of the vertical portion.

  According to the present invention, since the engine is disposed in a state where it is sunk below the chassis (support frame), the center of gravity of the traveling vehicle body can be lowered to improve traveling stability.

  In the configuration of the present invention, since the support frame has a frame structure that opens forward and backward, the lower part of the engine has an open structure that hits the wind, so that the wind can easily pass to the cylinder block and the cylinder head by traveling. As a result, the cooling performance can be improved. Further, since the engine support also serves as a reinforcing member for connecting the left and right side frames, it is possible to increase the rigidity of the chassis.

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

It is the whole rice transplanter in the state where the vehicle body cover was attached. (A) is an overall plan view of a rice transplanter, and (B) is an overall perspective view of a traveling vehicle body as viewed from the upper front obliquely. It is a partial separation perspective view of a traveling body. It is a perspective view of the traveling vehicle body which separated the engine. 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 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. 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 back” and “left and right” are used to identify the direction, and these words are displayed with reference to the operator seated in the forward direction of the rice transplanter. Yes. 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 to 2, the rice transplanter has a traveling vehicle body 1 and a seedling planting device 2 as basic elements, and the seedling planting device 2 can be raised and lowered to the rear part of the traveling vehicle body 1 via a link device 3. It is connected to.

  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 may be supplemented with a double system or a triple system. 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 (only the framework is shown only in FIG. 2) are arranged in front of the seat 6 and on the left and right sides.

  For example, as generally understood from FIGS. 3 and 4, the traveling vehicle body 1 includes left and right front side frames 9 and rear side frames 10 that extend in the front-rear direction. The left and right rear side frames 10 are narrower than the front side frame 9, and the front and rear side frames 9 and 10 are connected via a left and right laterally long midframe 11. The left and right front side frames 9 are connected by a front frame 12 at their front end portions. The mid frame 11 and the front frame 12 constitute the horizontally long frame material described in claim 2.

  The rear side frame 10 is tilted rearward in a side view so as to increase in height as it goes rearward, and a rear frame 13 constituting the horizontally long frame according to claim 2 at the rear ends of the left and right rear side frames 10. Are connected. 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). Although only a part is shown in FIG. 3, a bumper 15 is attached to the front frame 12.

  A rear lateral stay 17 is disposed slightly in front of the rear frame 13, and the rear lateral stay 17 is fixed to an upwardly-opening U-shaped hanger bracket 18 (see FIG. 3). It is welded to the rear side frame 10.

  A gate-type frame 19 having a downward opening is fixed to the front end portions of the left and right rear side frames 10, and the front end portion of the seat support unit 20 (see FIG. 1) is fixed to the gate-type frame 19. 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.

  A plurality of outward branch frames 22 projecting to the left and right sides are fixed to the front side frame 9, and the preliminary seedling stand 8 is supported by the branch frames 22. 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 22, the rear lateral stay 17, and the rear frame 13.

  In the present embodiment, a chassis (frame structure) is constituted by the front and rear side frames 9 and 10, the mid frame 11, the front frame 12, the rear frame 13, and the like. As shown in FIG. 2, a portion of the traveling vehicle body 1 on which a person is placed is covered with a vehicle body cover 24. The vehicle body cover 24 includes a front side frame 9, a branch frame 21, an auxiliary frame 23, a rear horizontal stay 17, a rear It is supported by a frame 13 or the like. A fertilizer is often arranged behind the seat 6, but is omitted in this embodiment.

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

  A mission case 27 incorporating a gear group is disposed behind the engine 26. 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 transmitted to the HST 28 by a belt 29. It is transmitted 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. 4, 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. Needless to say, the rotary arm 31 is biased by a spring (not shown) so that the tension pulley 30 always contacts the belt 29 with a predetermined strength. The handle post 25 has a power steering unit 32 attached to the front portion of the mission case 27, and the handle post 25 is fixed to the power steering unit 32.

  A 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 and 4, the rear end of the mission case 27 and the front end of the rear axle case 34 are connected by a joint material 36 made of a round pipe, and the joint material 36 and the midframe 11 are viewed from the front U They are connected by a reinforcing frame 37 of the mold. A fuel tank T is disposed between the joint material 36 and the seat 6, and the fuel tank T is supported by the joint material 36 via a receiving material 38.

  Further, as shown in FIG. 3, an elevation cylinder (hydraulic cylinder) 39 that is tilted backward as viewed from the side is connected to the joint member 36 via a bracket 40 so as to rotate around its front end. The link device 3 shown in FIG. 1 is rotated by the expansion and contraction of the lifting cylinder 39, and the seedling planting device 2 is lifted and lowered accordingly.

  For example, as shown in FIG. 4, a rear wheel drive shaft 41 is disposed on the left side with the joint member 36 in between, and a work power shaft 42 is disposed on the right side. The drive shaft 41 drives the rear wheels (if a leveling rotor is provided, this is also driven). Of course, the rear wheels 5 rotate in synchronization with the front wheels 4. The work power shaft 42 drives the seedling planting device 2 (and drives the fertilizer if it is provided), and is connected to a strain change device (not shown).

(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. 5, 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. 5, an 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, 3, 4, and 9).

  A silencer 51 is disposed directly to the left 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. 8).

  For example, as shown in FIG. 4, a disc 54 located inside the flywheel 49 is fixed to the left side surface portion of the engine main 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. 4 and 5, a support frame 55 is connected to a substantially front half of the left and right front side frames 9, and the engine body 44 of the engine 26 is supported by the support frames 55. The support frame 55 is made of a round pipe, and has a U-shape (or a horizontally long U-shape) as viewed from the front, having a left and right vertical portion and a lower horizontal portion connected to the lower end thereof.

  The front and rear support frames 55 are connected by reinforcing bodies (connection frames) 56 at the left and right intermediate portions thereof, and the engine support described in claim 1 is constituted by the support frames 55 and the reinforcement bodies 56. The reinforcing body 56 is bent downward in a side view and protrudes below the support frame 55. Therefore, the reinforcing body 56 also functions as a guard for the engine 26.

  A side bracket 57 is fixed to the right side of the front / 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 substantially U-shape opening inward in plan view. 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 front and rear (or 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. Therefore, the front and rear lower brackets 59 are in the shape of an inverted letter C when viewed from the side.

  On the other hand, as clearly shown in FIG. 6, left and right horizontally long upper brackets 60 are fixed to the front and rear surfaces of the lower portion 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 is tapered, so that the bolt 66 can be easily fitted. Further, when the front and rear lower brackets 59 are in a reverse C-shaped posture in a side view as in the embodiment, the engine 26 tends to be held between the front and rear lower brackets 59 by its own weight. Excellent functionality.

  As shown in FIG. 5, a rear bracket 70 projecting rearward is connected to a substantially right and left intermediate portion of the rear support frame 55. As shown in FIG. 5, 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 constitutes the structural material (strength member) of the traveling vehicle body 1.

  That is, in this embodiment, the chassis is constituted by frame materials such as the 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, the transmission case 27, and the joint material. 36, the rear axle case 34 cooperates to form the framework of the traveling vehicle body 1.

(3) Summary In the above configuration, the engine 26 is supported by the support frame 55 so as to sink below the front side frame, so that the center of gravity of the traveling vehicle body 1 is lowered to improve traveling stability. Can do. Since the front side frame 9 may remain in a horizontal position, the outer branch frame 22 is fixed to the front side frame 9 to support the vehicle body cover 24 and the spare seedling stand 8, and the auxiliary frame 23 is attached thereto. Therefore, the structure around the engine 26 is not 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 placed horizontally as in the present embodiment, there is an advantage that the engine 26 can be mounted while suppressing 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 member 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 this embodiment, the silencer 51 can be cooled in a state in which an increase in cost is suppressed. That is, utilizing the fact that the silencer 51 is disposed 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.

  Thus, since it is a simple structure which only fixes the cooling fan 72 to the outer surface of the flywheel 49, it does not raise a big cost. 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). Modification There are irregularities both on the field and on the road. For this reason, for example, the four wheels 4 and 5 are supported (ground resistance), for example, one wheel is in a floating state. ) Becomes unbalanced, and therefore the weight of the traveling vehicle body 1 may act as an external force that twists the traveling vehicle body 1 around the longitudinal longitudinal axis. In this regard, when the reinforcing frame 37 is provided as in the embodiment, the rigidity of the structure including the chassis, the transmission case 27, the joint material 36, the rear axle case 34, and the rear column 27 is significantly increased. In addition, the resistance to torsion can be significantly improved.

  In the modification shown in FIG. 10, a reinforcing function is provided so that the rigidity against torsion can be further improved. That is, in this modified example, the left and right side portions of the reinforcing frame 37 are connected by the longitudinal longitudinal reinforcing stays 73, and the reinforcing frame 37, the left and right reinforcing stays 73, and the rear axle case 34 constitute a substantially rectangular frame in plan view. Therefore, the resistance against torsion is increased (of course, the strength against bending is also increased). A receiving member 38 is welded to the reinforcing frame 37, and the receiving member 38 is fixed to a bracket 72 welded to the joint member 36 with bolts and nuts (both not shown).

  The reinforcing stay 73 uses a square steel pipe, and a front auxiliary bracket 74 having an outward U-shape is welded to the front end portion thereof. On the other hand, a substantially L-shaped support bracket 75 in plan view is welded to the left and right sides of the reinforcing frame 37, and the front auxiliary bracket 74 and the support bracket 75 are fastened by a plurality of bolts 76 and nuts 77. .

  Further, a rear auxiliary bracket 78 in a side view is welded to the rear end of the reinforcing stay 73, and the rear auxiliary bracket 78 is fixed to the front side surface of the rear axle case 34 with a bolt 79. A receiving seat 80 into which a bolt 79 is screwed is provided on the front side surface of the rear axle case 34. The receiving seats 80 are formed in pairs on the front and rear sides. When higher strength is required, the rear auxiliary bracket 78 may be fastened to the four receiving seats 80.

(6). Others This embodiment can be embodied in various ways in addition to the above embodiments. For example, the application target is not limited to the riding type rice transplanter, and can be applied to various farm work 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 can also be adopted.

  In the case of having a side frame as a chassis, the side frame does not need to be divided into separate front and rear members, and the whole may be connected to one. It is also possible to arrange the engine behind the operation floor (in this case, the mission case is often arranged in front of the engine). The engine support can employ various structures and forms such as a sheet metal.

  When a support frame is used as the engine support, it is possible to use one frame or three or more frames. It is also possible to connect a front frame and an intermediate frame parallel to the side frame to one side frame, and to connect one or more support frames to the front frame and the intermediate frame. It is also possible to support the mission case with a frame material connected to the side frame.

  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 Traveling vehicle body 2 Seedling planting device as an example of working device 3 Link device 4 Front wheel 5 Rear wheel 8, 9 Front side frame 11 Mid frame 12 Front frame 13 Rear frame 30 Hydraulic cylinder 24 Car body cover 24a Driving floor 26 Engine 27 Mission Case 50 Output pulley 51 Silencer 55 Support frame constituting the engine support 56 Reinforcing body constituting the engine support 58 Lower bracket 59 Upper bracket 62 Damping unit

Claims (1)

A traveling vehicle body (1) on which a person rides and operates and an engine (26) mounted thereon are provided. The traveling vehicle body (1) includes left and right side frames (9) (10) extending in the front-rear direction. And a chassis having a structure in which the frames are connected by the horizontally long frames (11), (12), and (13),
Provided in front of the left and right side frames (9) and (10) are two front and rear support frames (55) that project upwardly in a U-shape or U-shape in front view so as to protrude downward. The engine (26) is supported on the bottom of the support frames (55) by means of a plurality of vibration absorbing units (62), and the engine body (44) of the engine (26) The lower surface side is sandwiched between the both support frames (55) ,
Both the support frames (55) are made of round pipes, and are formed in a U-shape or a horizontally long U shape having a vertical part on the left and right and a lower horizontal part connected to the lower end thereof.
Riding type farm work machine.

Images