JPH0665250B2 - Reinforcement structure of walkable paddy work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a reinforcing structure for a walk-type paddy working machine such as a rice transplanter, a seeder, and a fertilizer applicator.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of walk-type paddy working machine, a frame structure in which a body frame is extended rearward from a rear portion of a transmission case, It is necessary to firmly connect the transmission case and the body frame.

Therefore, conventionally, reinforcement is performed by means such as forming a connecting portion between the transmission case and the body frame by a thick flange portion, or by fixing a dedicated reinforcing member such as a reinforcing rod between the both by supporting it. However, in such a case, there is a problem in that the weight of the machine body is heavy, and a reinforcing member is additionally required and the number of parts is large.

[Means for Solving the Problem] The present invention was conceived with the object of providing a reinforcing structure for a walk-behind paddy work machine capable of eliminating these drawbacks in view of the above circumstances. , The transmission case and the body frame are integrally arranged in the front and rear, and the chain case in which the traveling wheel is pivotally supported at the tip end is swung by the expansion and contraction operation of the hydraulic cylinder to move the traveling wheel up and down. In a walk-behind paddy work machine configured as follows,
The front and rear ends of the cylinder tube in the hydraulic cylinder are
The cylinder case is integrally supported and connected to the front transmission case and the rear body frame, respectively,
It is characterized by being configured as a strength member between the transmission case and the body frame.

According to the present invention, the strength of the joint between the transmission case and the machine body frame can be reliably increased by using the cylinder of the hydraulic cylinder for vertically moving the traveling wheels. It is the one.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 is a walk-behind rice transplanter, and the rice transplanter 1
Is equipped with an engine 2 in the front, and a front low rear height seedling placing table 3 is provided in the rear of the seedling placing table 3 by a planting operation of a planting claw 4 which is timed to run the aircraft. It is the same as in the past that the seedlings with unit planting are scraped and planted on the rice field.

Reference numeral 5 denotes a traveling wheel, and the traveling wheel 5 has an axle 5a at a rear end portion of a second chain case 6 which constitutes a bending type chain case.
The front end of the second chain case 6 is pivotally supported by the tip of the first chain case 7 so as to be swingable (flexible). The first chain case 7 has a support shaft 7a on the upper portion of the transmission case 8.
It is pivotally supported about the fulcrum. The traveling wheel 5 is adapted to be rotated by the driving force from the engine being transmitted through the transmission case 8, the first chain case 7 and the second chain case 6 as power.

Reference numeral 9 denotes a machine body frame (transmission case) in which a front end flange portion is integrally attached to a rear end portion of the transmission case 8. The machine body frame 9 includes a chain located behind the machine body from the transmission case 8. A power transmission chain 11 for power transmission is internally provided on the case 10 side, and a support shaft 12 penetrating in the left and right lateral directions so as to pass between the upper and lower chains of the body frame 9 is rotatably supported. Therefore, the support shaft 12 is arranged such that its position is located between the axle 5a and the support shaft 7a of the first chain case 7, but one end portion (left side in the embodiment) Actuating arm 13 on the end)
The intermediate boss portion 13a is pivotally supported around the axis and the base end portion of the lock plate 14 is integrally fixed.

On the other hand, the intermediate boss 15a of the actuating arm 15 is integrally attached to the other end (right end in the embodiment) of the support shaft 12 by spline fitting. Further, the lock plate 14 is elastically mounted so that the lock pin 14a always protrudes by the ammunition machine 14b and fits into the locking hole 13d formed on the operating arm 13 side. Is integrated with the lock plate 14. That is, the operating arm 13 is supported by the lock pin 14
12, and further, it has a structure that is integrated with the other actuating arm 15, which allows the left and right actuating arms to operate during locking.
13 and 15 are configured to simultaneously swing about the support shaft 12. Further, the lock pin 14a is retracted against the ammunition 14b by an operation linked to, for example, the operation of entering the planting clutch lever, and is pulled out from the locking hole 13d, whereby the operating arm 13 becomes free from the lock plate 14, and Thus, the left and right actuating arms 13 and 15 are configured to be independently swingable around the support shaft 12. Moreover, these operating arms 1
The front end portions of 3 and 15 are pivotally attached to the middle portion of the second chain case 6 so as to be swingable 13b and 15b, respectively.

On the other hand, reference numeral 16 is a cylinder cylinder that constitutes a hydraulic cylinder for controlling the lifting and lowering of the machine body, and is obliquely provided above the machine body frame 9 in a front-rear-lower shape. A valve case 17 that houses a switching valve is integrally provided at the base end of the cylinder cylinder 16. The valve case 17 is further attached to a bracket 18 integrally fixed to the machine body frame 9 with a tightening bolt 18a. It is fixed integrally by. Further, the front end of the cylinder cylinder 16 is integrally fixed to a mounting seat 8a integrally projecting from the transmission case 8 with a tightening bolt 8b, whereby the cylinder cylinder 16 is A reinforcing frame structure having a triangular shape is formed as a strength member between the transmission case 8 and the rear body frame 9.

Further, in the embodiment, the mounting bracket 19a of the fuel tank 19 is integrally mounted with the front end portion of the cylinder tube 16, but the cylinder rod 16a is provided in the space between the fuel tank 19 and the transmission case 8. The expansion / contraction operation is performed so that a space behind the engine 2 and in front of the transmission case 8 is widely secured without being obstructed by the expanding / contracting cylinder rod 16a, for example, inspection and maintenance of the air cleaner 2a. In addition to improving the maintainability of the, the space behind the cylinder tube 16 can be secured widely, and it is possible to secure the installation space for other members, for example, the members such as the fertilizer drive unit when a fertilizer applicator is mounted. It has also become possible to contribute to shortening the body length if necessary.

At the tip of the cylinder rod 16a, the center of a balance arm 21 is pivotally supported by a pin 21a so that a bullet 20 is interposed. The front end of the operating rod 22 is connected to both left and right ends of the balance arm 21, and the rear end of the operating rod 22 is pinned to the rear ends of the operating arms 13 and 15 described above.
It is pivotably supported by 13c and 15c. An upper end of a sensing rod 24 having a lower end connected to the float 23 is connected to a switching plate 17b integrally attached to a valve shaft 17a protruding from the valve case 17. Then, the cultivator changes in depth with the traveling of the airframe, and the switching plate 17b oscillates in association with the vertical swing of the float 23 caused by the vertical swing of the float 23 caused by the change in the ground contact pressure from the paddy field. As a result, the valve is switched and the cylinder rod 16a is expanded and contracted. The expansion and contraction control of the cylinder rod 16a is such that when the tiller is deepened and the machine body sinks, and the ground contact pressure of the float 23 is increased, the cylinder rod 16a is extended, whereby the left and right operation rods 22 are moved forward. The actuating arms 13 and 15 are simultaneously pushed by the second chain case 6 and are pivotally connected to the second chain case 6.
The support shaft 12 swings so that b and 15b are displaced downward, and the traveling wheels 5 are substantially moved by the bending displacement operation of the first chain case 7 and the second chain case 6 accompanying this. The vertical movement is performed in the vertical direction, and the traveling wheels 5 are moved downward by the depth of the cultivator. In this manner, the raising / lowering control of the traveling wheels 5 of the machine body is performed. Then, the planting work is performed within the range of vertical movement of the traveling wheels 5 in the vertical direction. However, in the case of traveling of the body, the traveling wheels 5 are further lowered to lift the body 1. However, in this case, the traveling wheels 5 are displaced rearward to bring the vehicle body into the front balance state.

In the embodiment, the vertical displacement position of the traveling wheel 5 is adjusted by adjusting holes 13e and 15e provided in the operating arms 13 and 15 to correspond to Fukada and Asada. ,
In this case, the adjustment holes 13e and 15e are arranged not on the operation rod 22 side but on the operation arms 13 and 15 side, and moreover, in a circular arc shape with respect to the axis of the operation arm, so that the displacement locus of the traveling wheel is It is designed so that it can always be operated in a fixed trajectory range without accidentally changing.

In the embodiment of the present invention configured as described above, the transmission case 8 on the front side and the body frame 9 on the rear side are arranged in front of and behind the cylinder cylinder 16 for controlling the vertical movement of the traveling wheels 5 as described above. Both ends are integrally connected and fixed to each other to serve as a strength member between the two members 8 and 9 to form a substantially triangular reinforcing frame structure. Therefore, the flange-shaped connecting portion between the transmission case 8 and the machine body frame 9 is in a state of being strongly reinforced by the cylinder tube 16, and accordingly, the flange connecting portion is reinforced with a particularly thick wall, Alternatively, it is not necessary to reinforce using a reinforcing rod separately, and the cylinder cylinder 16 of the hydraulic cylinder, which is a member that is absolutely necessary for controlling the vertical movement of the traveling wheels 5 in the walk-behind rice transplanter, is simply tilted between the two. Due to the extremely simple structure that is simply connected and fixed in a fixed shape, the cylinder cylinder 16 can be effectively used as it is to measure the strength up of the connecting portion, and the structure is simplified in addition to the effective use of the members. ,
Not only is it possible to reduce the number of parts, it will also contribute greatly to reducing the weight of the aircraft.

Moreover, in this structure, since the cylinder cylinder 16 is inclined in a front high rear low shape, and the cylinder rod 16a extends and contracts in the dead space on the rear upper side of the engine 2 and on the lower front side of the fuel tank 19. The installation space, which must be secured when installing the hydraulic cylinder, can be effectively overlapped on the engine 2 side, thus greatly contributing to the compactness of the machine body. The control mechanism can be arranged on the front side of the machine body as much as possible, and the machine body balance can be improved.

The present invention is not limited to the above-mentioned embodiment, and the point is that the cylinder case front and rear end portions of the hydraulic cylinder for vertically controlling the traveling wheels are integrally fixed to the transmission case and the machine body frame, respectively. It is sufficient that the transmission case, the body frame, and the cylinder tube form a substantially triangular reinforcing structure. Therefore, the chain case is not limited to the bending type, but a single type. Of course, it may be one.

[Advantages] In short, since the present invention is configured as described above, the front transmission case and the rear machine frame are cylinder cylinders of hydraulic cylinders required for vertical movement of traveling wheels. Will be connected by a reinforcing structure that acts as a strength member.Therefore, there is no need to reinforce the connecting part between them with a thick flange part or using a separate reinforcing rod as in the past, and walking Therefore, the cylinder of the hydraulic cylinder, which is a necessary member for the paddy work machine, can be effectively used as it is to surely reinforce it. For this reason, in addition to effective use of members, simplification of the structure and reduction of the number of parts cannot be permitted, and the weight of the machine body can be greatly contributed.

[Brief description of drawings]

The drawings show an embodiment of a chain case structure of a reinforcing structure for a walk-behind paddy work machine according to the present invention. FIG. 1 is an overall side view of a walk-behind rice transplanter, and FIG. Fig. 3 is a plan view of the same as above, Fig. 4 is an enlarged side view of an essential part, Fig. 5 is a plan view of the same as above, Fig. 6 is a vertical cross-sectional view of a machine frame, and Fig. 7
The figure is a diagram for explaining the operation. In the figure, 1 is a traveling body, 5 is a traveling wheel, 8 is a transmission case, 9 is a body frame, 16 is a cylinder cylinder, 16
a is a cylinder rod.

Claims (1)

[Claims] 1. A transmission case and a machine body frame are integrally arranged in the front and rear, and a chain case in which a traveling wheel is pivotally supported at a tip portion is rocked by an expansion and contraction operation of a hydraulic cylinder to move the traveling wheel. In a walk-behind paddy working machine configured to move up and down, the front and rear ends of the cylinder tube of the hydraulic cylinder are integrally supported and connected to the front transmission case and the rear machine frame, respectively. A reinforcing structure for a walk-behind paddy work machine, characterized in that the cylinder cylinder is configured as a strength member between the transmission case and the machine body frame.