JP4527006B2 - Walking type agricultural machine - Google Patents

Description

  The present invention relates to a walk-type farm work machine capable of mounting a rear work machine on the rear part of the mission case in addition to the front work machine provided at the front part of the mission case, in particular, a rear hitch to which the rear work machine is mounted, The present invention relates to a walking type agricultural working machine that can be transformed into a working posture and a flip-up posture.

In addition to the front working machine provided in the front part of the mission case, a walking type agricultural working machine in which a rear working machine can be mounted on the rear part of the mission case is known (see, for example, Patent Documents 1 to 3). In this type of walking type farm work machine, the rear hitch to which the rear work machine is attached can be transformed into a working posture and a flip-up posture, and the rear work device needs to be flipped up when the machine turns and moves. . This is because the rear working machine enters the soil when the handle is lowered to raise the front working machine when the machine is turned or moved.
JP-A-10-225205 JP 2004-215602 A JP 2001-238504 A

  However, the rear hitch described in Patent Documents 1 and 2 connects a fixed bracket attached to the rear part of the transmission case and a movable bracket to which the rear working machine is mounted so as to be movable up and down via a plurality of links. Since the parallel link mechanism is configured, there are problems that the number of parts is large and the structure is complicated. Further, the rear hitch described in Patent Documents 1 and 2 includes a bullet machine that urges the movable bracket toward the working posture or the flip-up posture, but since both the left and right sides are open, dust There is a problem that not only the residue is easily attached but also the appearance is deteriorated.

  On the other hand, in the walking type agricultural working machine described in Patent Document 3, the fixed bracket and the movable bracket are connected via a single rotating support shaft, so the number of parts is small and the structure can be simplified. However, there is a problem in operability when raising and lowering the rear working machine because it does not include an ammunition for urging the movable bracket toward the working position or the flip-up position.

The present invention has been created in order to solve these problems in view of the above-described circumstances, and includes wheels provided on the left and right sides of the transmission case and a rear upper portion from the rear portion of the transmission case. A handle frame to be taken out, a front work machine provided at a front part of the mission case, and a rear hitch provided at a rear part of the mission case and detachably attachable to the rear work machine. In the walking type agricultural work machine capable of changing into a working posture and a flip-up posture, the rear hitch includes a fixed bracket attached to a rear portion of the transmission case, and a single pivot on the fixed bracket. A movable bracket coupled to the movable bracket, a work machine coupling portion provided on the movable bracket, the fixed bracket, and the movable bracket. And an elastic machine that urges the movable bracket toward a working posture or a flip-up posture, and the movable bracket is formed in a U shape in a plan view. have covered the left and right both sides, to the fixing bracket, provided with a shaft member for supporting one end of the bullet machine, is a shaft member walk-agricultural machine, characterized in that rice retaining in said movable bracket. In this way, the number of parts can be reduced and the structure can be simplified compared to the case where the fixed bracket and the movable bracket are connected by a parallel link, and the elastic bracket that urges the movable bracket toward the working posture or the flip-up posture. Because it has a machine, it can improve the operability when raising and lowering the rear work machine.Furthermore, since the left and right sides of the machine are covered with a movable bracket, dust and residues are not easily attached to the machine. In addition, the appearance can be improved, and a dedicated retaining member for retaining the shaft member is not required, so that the number of parts can be reduced and the structure can be simplified.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a walk-type farm work machine, and the walk-type farm work machine 1 includes a mission case 2 having a substantially square shape in side view, which is also used as a body frame. Wheels 4 are pivotally supported on the left and right sides of the rear end portion of the transmission case 2 via axles 3, and a rotary tillage shaft (front working machine) is extended to the left and right outer sides at the front end portion of the transmission case 2. ) 5 is pivotally supported.

  An engine 6 is mounted on the top of the mission case 2. The engine 6 inputs power to the transmission case 2 via a main clutch (not shown) formed of a tension clutch. The transmission 2 includes a transmission including a traveling transmission mechanism that shifts traveling power and a tillage transmission mechanism that varies tilling power. That is, the transmission case 2 of the present embodiment is used both as a traveling transmission case that transmits driving force from the engine 6 to the wheels 4 and a tillage transmission case that transmits driving force from the engine 6 to the rotary tillage shaft 5. .

  A handle frame 7 that extends rearward and upward is bolted to the rear portion of the mission case 2. A proximal end portion of a handle 8 formed in a substantially U shape in plan view is attached to a distal end portion of the handle frame 7 via a bolt 9 with a knob. When the knob-attached bolt 9 is tightened, the handle 8 is fixed, while when the knob-attached bolt 9 is loosened, the handle 8 is allowed to rotate back and forth (fold).

  Furthermore, a rear hitch 11 to which the rear working machine 10 can be detachably attached is provided at the rear part of the mission case 2. For example, as shown in FIG. 1, when a rear working machine 10 composed of a vertical machine is attached to the rear hitch 11, a tilling work by the front working machine (rotary tilling shaft 5) and a vertical work by the rear working machine 10 are performed. It can be done at the same time.

  The rear hitch 11 is configured to freely change between a working posture and a flip-up posture, and allows the rear work device 10 to be flipped up when the airframe is turned or moved. More specifically, the rear hitch 11 of this embodiment can be turned up and down via a fixed bracket 12 fixed to the rear portion of the transmission case 2 by a bolt and a single rotation support shaft 13 to the fixed bracket 12. The movable bracket 14 to be coupled, the work machine coupling portion 15 provided on the movable bracket 14, and the fixed bracket 12 and the movable bracket 14 are interposed, and the movable bracket 14 is brought into a working posture or a jumping posture by exceeding the fulcrum. And an ammunition 16 that is biased toward the head.

  When the rear hitch 11 is configured in this way, the number of parts can be reduced and the structure can be simplified as compared with the case where the fixed bracket 12 and the movable bracket 14 are connected by a parallel link. Since the ammunition machine 16 that is biased toward the posture is provided, the operability when raising and lowering the rear work machine 10 can be improved. The work machine connecting portion 15 is a pipe that faces in the vertical direction. By inserting a connecting bar 10a on the rear work machine 10 side and securing it with a pin 15a, the rear work machine 10 is rear hitch. 11 is attached.

  The movable bracket 14 is configured to follow the handle frame 7 when in the flip-up posture. For example, in this embodiment, when the movable bracket 14 is flipped up, the movable bracket 14 and the handle frame 7 are in a substantially parallel posture with a slight gap. In this way, not only can the interference between the movable bracket 14 and the handle frame 7 be avoided, but also the inconvenience of the rear hitch 11 being obstructed when working without the rear work machine 10 being attached.

  The upward rotation range of the movable bracket 14 is restricted by the upper limit stopper 12a. The upper limit stopper 12a of the present embodiment is formed by bending the left and right upper end portions of the fixed bracket 12 outwardly, and makes contact with the upper end portion of the movable bracket 14, thereby restricting the rotation of the movable bracket 14. When the upper limit stopper 12a is configured in this way, a dedicated stopper member is not required, so that not only the number of parts can be reduced and the structure can be simplified, but also the strength of the fixed bracket 12 can be increased by the upper limit stopper 12a.

  The movable bracket 14 is formed in a U shape in plan view and covers both the left and right sides of the ammunition 16. In this way, not only is it difficult for dust and residue to adhere to the ammunition, but also the appearance of the rear hitch 11 can be improved. In addition, since the ammunition machine 16 of the present embodiment is composed of a compression coil spring, the rear hitch 11 can be made more compact than when a tension coil spring is used.

  The fixed bracket 12 is provided with a shaft member 17 that supports one end of the bullet machine 16 in a penetrating manner in the left-right direction. The movable bracket 14 also has a shaft member 18 that supports the other end of the bullet machine 16. It is installed in a penetrating manner in the left-right direction. Here, the shaft member 18 provided on the movable bracket 14 is secured by using a retaining ring 18 a, while the shaft member 17 provided on the fixed bracket 12 is retained by utilizing the inner surface of the movable bracket 14. Is done. This eliminates the need for a dedicated retaining member for retaining the shaft member 17, thereby reducing the number of parts and simplifying the structure.

  On the outer surface of the movable bracket 14, a lowering lock mechanism 19 that locks the lowering of the movable bracket 14 that has been flipped up is provided. This is to prevent the rear working machine 10 that has been bounced up from falling down on its own, and it is required to allow the lowering of the rear working machine 10 by a predetermined unlocking operation. The lowering lock mechanism 19 of the present embodiment is provided so as to be able to protrude and retract in the lock hole 12b formed in the fixed bracket 12 and the movable bracket 14, and is engaged with the lock hole 12a when the movable bracket 14 is operated in the flip-up posture. The lock pin 20 is configured to be provided, an ammunition machine 21 for urging the lock pin 20 in the engaging direction, and a knob plate 22 for unlocking (pulling) the lock pin 20.

  According to the present embodiment configured as described, the wheels 4 provided on the left and right sides of the mission case 2, the handle frame 7 extending rearward and upward from the rear portion of the mission case 2, and the front portion of the mission case 2 A front work machine (rotary tilling shaft 5) provided on the rear side of the transmission case 2 and a rear hitch 11 which can be detachably attached to the rear work machine 10 and the rear hitch 11 in a working posture. In the walking type agricultural working machine 1 that can be transformed into a flip-up posture, the rear hitch 11 includes a fixed bracket 12 attached to the rear portion of the mission case 2 and a single pivot support shaft 13 on the fixed bracket 12. The movable bracket 14 is connected to the movable bracket 14 so as to be pivotable up and down, the work machine connecting portion 15 provided on the movable bracket 14, the fixed bracket 12 and the movable bracket And an elastic machine 16 that is interposed between the movable bracket 14 and urges the movable bracket 14 toward a working posture or a flip-up posture, and the movable bracket 14 is formed in a U shape in plan view. Since both the left and right sides are covered, the number of parts can be reduced and the structure can be simplified compared to the case where the fixed bracket 12 and the movable bracket 14 are connected by a parallel link. The operability when raising and lowering the rear working machine 10 can be improved, and further, by covering the left and right sides of the munition 16 with the movable bracket 14, Not only is it difficult for dust and residues to adhere to the ammunition 16, but also the appearance can be improved.

  In addition, the fixed bracket 12 is provided with the shaft member 17 that supports one end of the ammunition 16 and the shaft member 17 is secured by the movable bracket 14, so that a dedicated retaining member for retaining the shaft member 17 is not required. As a result, the number of parts can be reduced and the structure can be simplified.

It is a side view of a walk type farm work machine. It is a side view of a rear hitch. FIG. 6 is a cross-sectional view of a rear hitch. It is the perspective view which looked at the rear hitch from the side. It is the perspective view which looked at the rear hitch from the upper part.

Explanation of symbols

1 Walking-type farm work machine 2 Mission case 4 Wheel 5 Rotary tillage shaft (front work machine)
6 Engine 7 Handle frame 10 Rear working machine 11 Rear hitch 12 Fixed bracket 13 Rotating support shaft 14 Movable bracket 15 Working machine connecting part 16 Ejector 17 Shaft member 18 Shaft member

Claims (1)

Wheels provided on the left and right sides of the mission case;
A handle frame extending rearward and upward from the rear of the mission case;
A front working machine provided at the front of the mission case;
A rear hitch provided at the rear of the mission case and capable of detachably attaching a rear work machine,
In the walking type agricultural machine capable of transforming the rear hitch into a working posture and a flip-up posture,
The rear hitch
A fixed bracket attached to the rear of the mission case;
A movable bracket coupled to the fixed bracket via a single pivot shaft so as to be pivotable up and down;
A work machine connecting portion provided on the movable bracket;
An elastic machine interposed between the fixed bracket and the movable bracket and biasing the movable bracket toward a working posture or a flip-up posture;
The movable bracket is formed in the U-shaped plan configuration, not covering the left and right both sides of the bullet machine,
A walking type agricultural working machine characterized in that a shaft member that supports one end of the bullet machine is provided on the fixed bracket, and the shaft member is secured by the movable bracket .

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