JP2837566B2 - Elevating structure of riding paddy working machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting type structure of a riding type paddy working machine such as a riding type rice transplanter and a riding type fertilizer.

[0002]

2. Description of the Related Art In general,
In this type of riding type paddy working machine, a working unit connected to the rear of the machine via an elevating link mechanism is used to extend and retract a hydraulic cylinder (single-acting type) interposed between the machine and the elevating link mechanism. It is configured to move up and down (while rising by extension operation based on supply of hydraulic oil to the hydraulic cylinder, while falling by its own weight by reduction operation based on oil drainage allowance of the hydraulic cylinder). However, conventionally, since the hydraulic cylinder is disposed in a rearwardly inclined state so as to extend and operate upward and rearward, the operating force is directed rearward similarly to the traction load of the working unit acting on the lifting link mechanism. Will be lost. That is, as shown in FIG. 7, a large load is applied to the support portion (mast) of the lifting link mechanism, so that the supporting portion of the lifting link mechanism must be made particularly strong, and the weight of the machine increases. When the working part connected to the machine is a planting working part, the interference between the hydraulic cylinder that tilts backward and upward and the seedling table that tilts forward and upward In order to avoid this problem, it is necessary to separate the working unit from the body, and as a result, there is a disadvantage that the entire length of the body including the working unit becomes particularly long. Conventionally, when the hydraulic cylinder is extended, its extension end portion may protrude above the cover body covering the body, and in this case, in the vicinity of the rear of the driver's seat mounted on the cover body. Since the hydraulic cylinder expands and contracts in an exposed manner at the position, there is no danger that the extension end of the hydraulic cylinder may be damaged by contact with other members, and this is also a problem to be solved for safety.

[0003]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned circumstances, and has as its object to provide an elevating part structure of a riding type paddy working machine capable of eliminating these disadvantages. In a riding type paddy working machine in which a traveling machine body to which a working unit is connected via a lifting link mechanism at the rear is covered with a cover body that positions at least a driver's seat, the traveling machine body and the lifting link mechanism are disposed between the traveling machine body and the lifting link mechanism. A hydraulic cylinder for elevating and lowering the working unit, which is disposed in a forwardly inclined position so that its extending direction is directed forward and upward, is interposed. Are formed with reinforcing ribs that bulge upward into the inner surface. According to the present invention, with this configuration, the towing load on the working unit can be significantly reduced, and at the same time, protection of the hydraulic cylinder, improvement of safety, and the like can be achieved.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine of a riding type rice transplanter, and a mast 3 erected on a rear portion of a body frame 2 of the traveling machine 1 is provided with a lifting link mechanism 6 composed of an upper link 4 and a lower link 5. The planting work unit 7 is connected to be able to ascend and descend via the base, and all of these basic configurations are conventional.

Reference numeral 8 denotes a hydraulic cylinder for elevating and lowering the working unit. The hydraulic cylinder 8 is interposed between a bracket 9 a protruding from the rear end of a rear axle case 9 and the upper link 4. Therefore, the planting work section 7 is moved up and down based on the expansion and contraction operation, and the hydraulic cylinder 8 in the present invention is arranged in the forwardly inclined posture so that the extension operation direction is directed forward and upward. That is, the hydraulic cylinder 8 is provided on the seedling table 1
It is arranged so as to follow the inclination direction of 0, and the traction force acting on the mast 3 is reduced by performing the extension operation so as to push back the traction force of the planting work section 7 forward.

On the other hand, reference numeral 11 denotes a cover body for covering the upper half of the traveling machine body 1. The cover body 11 includes a control panel mounting portion 11a at a front end, a step 11b at an intermediate portion, and a driver seat at a rear end. The hydraulic cylinder 8 is formed by resin molding so as to integrally include the portion 11c and the like, and is formed at the rear position of the driver's seat mounting portion 11c in an upwardly bulging shape so that the extension end of the hydraulic cylinder 8 enters the inner surface. Reinforcing ribs 11
d is integrally formed. That is, the reinforcing rib 11d is
The cover body 11 is reinforced so that the hydraulic cylinder 8 does not protrude above the cover body 11 and does not expand and contract in an exposed manner near the rear of the driver's seat 12.
At the rear end.

In the embodiment of the present invention configured as described above, the planting work section 7 moves up and down based on the expansion and contraction operation of the hydraulic cylinder 8, but the expansion and contraction direction of the hydraulic cylinder 8 is upward and forward. Because it is arranged in a forward inclination to face,
The load acting on the mast 3 which is the support of the lifting link mechanism 6 can be significantly reduced. That is, paying attention to the upper link fulcrum A of the mast 3, as shown in FIG. 6, the fulcrum A has a load P1 acting on the working part connection fulcrum D of the lower link 5 (because the center of gravity of the working part is behind the fulcrum D). The total force P4 of the applied load), the load P2 (working part weight) acting on the working part connecting fulcrum C of the upper link 4 and the traction load P3 of the planting working part 7 acts during work traveling. The hydraulic cylinder 8 receives the resultant force P4 as a compression force and opposes it, and furthermore, at the time of extension operation, the extension operation force P5 acts upward and forward to cancel the resultant force P4. Can be significantly reduced. Therefore, it is not necessary to reinforce the mast 3 particularly strongly as in the prior art, and as a result, it is possible to greatly contribute to weight reduction of the body.

In addition, since the hydraulic cylinders 8 arranged in the forward inclination follow the inclination of the seedling mounting table 10 provided in the planting work section 7, the hydraulic cylinder 8 and the seedling mounting table 10 associated with the expansion and contraction operation are provided. The planting work unit 7 can be arranged close to the body without considering the interference of the planting work unit.
The overall length of the fuselage including the vehicle can be significantly reduced.

Further, in the cover body 11, an upwardly swelling reinforcing rib 11 is provided at a position rearward of the driver's seat mounting portion 11c so that the extension end of the hydraulic cylinder 8 enters the inner surface.
Since d is integrally formed, the cover body 11 is reinforced, and of course, the hydraulic cylinder 8 is prevented from protruding above the cover body 11 and extending and contracting in an exposed manner at a position near the rear of the driver's seat 12. As a result, it is possible to protect the hydraulic cylinder 8 or remarkably improve safety.

[0010]

In summary, since the present invention is constructed as described above, the working unit moves up and down based on the expansion and contraction operation of the hydraulic cylinder. Since it is disposed to be inclined forward to face, the load acting on the support of the lifting link mechanism can be significantly reduced. In other words, the traction load of the working part acts on the support portion of the lifting link mechanism toward the rear, but the hydraulic cylinder receives the traction load in the compression direction and opposes it, and at the time of the extension operation, the hydraulic cylinder receives the traction load. Since the extension operation force acts forward and upward to offset the traction load, the load acting on the support of the lifting link mechanism can be significantly reduced. Therefore, it is not necessary to reinforce the supporting portion of the elevating link mechanism as in the prior art, and this greatly contributes to the weight reduction of the body.

In addition, when the working unit connected to the machine body is the planting work unit, the hydraulic cylinder disposed in a forwardly inclined state follows the inclination of the seedling table provided in the planting work unit. Therefore, the planting work section can be arranged close to the machine without considering the interference between the hydraulic cylinder and the seedling mounting table due to the expansion and contraction operation, and as a result, the total length of the machine including the planting work section can be significantly reduced. it can.

Furthermore, an upwardly bulging reinforcing rib into which the extension end of the hydraulic cylinder enters the inner surface is formed at a position behind the driver seat arrangement portion of the cover body that covers the traveling body, so that the cover body is reinforced. Needless to say, it is possible to prevent the hydraulic cylinder from projecting above the cover body so as to expand and contract in an exposed manner at a position near the rear of the driver's seat. As a result, it is possible to protect the hydraulic cylinder and ensure its damage. It is possible to significantly improve safety.

[Brief description of the drawings]

FIG. 1 is a side view of a riding type rice transplanter.

FIG. 2 is a side view showing a main part of the same showing an operation.

FIG. 3 is a perspective view of a cover body.

FIG. 4 is a side view of the same.

FIG. 5 is a rear view of the same.

FIG. 6 is a side view of a lifting link showing an operation.

FIG. 7 is a side view of the same example showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 2 Body frame 3 Mast 6 Elevating link mechanism 7 Planting work part 8 Hydraulic cylinder 11 Cover body 11c Driver's seat mounting part 11d Reinforcement rib

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 58-88815 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) A01C 11/02 A01B 63/10

Claims (1)

(57) [Claims] 1. A riding paddy working machine in which a traveling machine body to which a working unit is connected via a lifting link mechanism at the rear is covered by a cover body for positioning at least a driver's seat, wherein the traveling machine body, the lifting link mechanism and A hydraulic cylinder for raising and lowering the working unit, which is disposed in a forwardly inclined position so that the extension direction thereof is directed forward and upward, is interposed. An elevating part structure of a riding type paddy working machine, wherein a reinforcing rib having an upwardly swelling shape is formed such that an extension end part enters an inner surface part.