JP2514725Y2 - Lifting device for working unit of riding work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a working unit elevating device for a riding work machine such as a riding rice transplanter, and more particularly to an arrangement structure of hydraulic cylinders for raising and lowering the working unit.

(B) Conventional technology Conventionally, in a riding work machine in which a working unit mounted on a rear portion of a machine body is vertically movable by a hydraulic cylinder, it is provided at a lower rear position of a transmission arranged on a front portion of the machine body. The base of the hydraulic cylinder was attached to the pivot point, and the tip of the hydraulic cylinder was extended to the rear of the machine and connected to the working section.

(C) Problems to be Solved by the Invention However, if the base of the hydraulic cylinder is connected to a rotation fulcrum provided at the lower rear portion of the transmission, there is a drawback that the base of the cylinder is lowered and the ground clearance of the airframe is lowered. At the same time, it is necessary to pass the fulcrum shaft that supports the base of the hydraulic cylinder through the transmission. Since it is made of casting, a core or the like is required, and the molding process is complicated and costly. Further, since the hydraulic cylinder is connected to the rear part of the transmission, a large return stroke is required to move up and down the working part mounted on the rear part of the machine body, which is a waste of space.

(D) Means for Solving the Problems The present invention is intended to solve the above problems, and for example, referring to FIGS. 1 to 4,
Attach the working unit (11) mounted on the rear of the machine to the hydraulic cylinder (3
9) In the riding work machine (1) that can be moved up and down freely, the mission case (16) is arranged in the front part of the machine body,
Two main frames (19), which are arranged in parallel and spaced apart from each other and extend rearward, are connected to the mission case (16), and a cylinder mounting bracket (37) is provided between the main frames (19a) and (19b). By connecting the base portion (39a) of the hydraulic cylinder (39) to the cylinder mounting bracket (37) in a rotatable manner, and extending the tip portion (39b) of the hydraulic cylinder (39) toward the rear of the machine. It is characterized by being connected to the part (11).

(E) Action Based on the above configuration, when the operator operates the working unit (11) to move up and down, the hydraulic cylinder (39) expands and contracts, and the working unit (11) moves up and down. In this case, the base of the hydraulic cylinder (39) uses the cylinder mounting bracket (37) bridged between the main frames (19a) and (19b) extending rearward from the mission case (16) at the front of the machine as a fulcrum shaft. The tip end portion extended to the rear of the machine body expands and contracts, and the working unit (11) connected to the tip end portion moves up and down.

(F) Effect of the Invention As described above, according to the present invention, the cylinder mounting bridged between the main frames (19a) and (19b) extending rearward from the mission case (16) arranged at the front of the machine body Attach the base (39) of the hydraulic cylinder (39) to the bracket (37).
Since a) is connected, the work machine (1
Since the distance to 1) is short, it is possible to use the one with a short cylinder stroke, and the effective space can be made correspondingly. Further, the base portion (39a) of the hydraulic cylinder (39) can be arranged at a high position, and the ground clearance of the machine body can be increased. Furthermore, there is no need for a molding process to pass a fulcrum shaft for the hydraulic cylinder (39) through the mission case (16), which reduces costs and the mission case (16) does not need to be connected to the hydraulic cylinder (39). Therefore, it is possible to arrange it on the front part of the machine body as much as possible, so that the step surface for the operator can be widened.

(G) Example An example of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the riding rice transplanter 1 has a traveling machine body 5 supported by front wheels 2, 2 and rear wheels 3, 3, and the traveling machine body 5 has an engine above the front wheels 2. 6 is mounted. A fertilizer tank 9 is arranged on the left and right sides in front of the traveling machine body 5, and at the rear portion of the traveling machine body 5, a working unit 11 is moved up and down via a parallel link device 10 including an upper link 10a and a lower link 10b. It is supported freely. The working section 11 has a seedling stand on which a large number of planters 12, floats 13, fertilizer application nozzles 15 and mat seedlings are placed.
16 is provided and seedlings are planted by the operation of the planter 12 and fertilizer is applied to the field from the fertilizer tank 9 through the fertilizer nozzle 15 as needed.

Further, as shown in FIG. 1 to FIG.
Is provided with a mission case 16 at a portion below the engine 6 and supported by the front wheels 2, 2, and a main frame is attached to the mission case 16 via a mounting plate 17.
19 are linked and connected. The main frame 19 has a pipe structure with a rectangular cross section, and the left main frames 19 are arranged in parallel with each other in the longitudinal direction of the body.
It consists of two frames, a and the right main frame 19b.

The front portion of the main frame 19 is shown in FIGS.
As shown in the figure, it extends from the mission case 16 in a substantially horizontal direction, and the rear part is bent vertically so as to form an arc from the horizontal direction to the height direction and rises vertically. Further, as shown in FIG. 4, the upper end of the vertically raised main frame 19 has a left side main frame 19a.
Is bent horizontally in an arc toward the left side of the fuselage and then kept horizontal, and the right main frame 19b is also bent horizontally in the right side of the fuselage and kept horizontal. A top plate cover 20 made of a steel plate having a rectangular shape in plan view is fixed to the upper end portions of the main frames 19.
One end of sheet mounting plates 21 having a U-shaped cross section is fixed at two locations near the center of the upper part of the table. Also, the other ends of these seat mounting plates 21, 21 and the main frame 19
Between the a and 19b, brackets 22 and 22 are fixed in a streak shape through a gap opened in the top cover 20. Also, on these seat mounting plates 21, 21,
As shown in FIG. 1, a seat 23 is attached, and a steering wheel 25, a shift lever 26, etc. are arranged in front of the seat 23.

In addition, instead of bending the upper end of the main frame 19 described above in the lateral direction of the body, the main frame 19 is fixed vertically so that another frame is fixed to the upper end so as to extend in the lateral direction. As a part of the above, the top cover 20 may be fixed on the top cover 20.

In addition, as shown in FIGS. 2 and 4, at the upper end of the left main frame 19a supporting the top cover 20,
The hanging plate 27 is fixed and hung, and the same thing as the hanging plate 27 is fixed and hung on the top plate cover 20 at a predetermined distance. A battery support 29 is attached to the lower ends of both hanging plates 27 and 27. Has been. Further, a screw 31 for stopping the control unit is fixedly mounted on the suspension plate 27 suspended from the main frame 19a, so that the control unit can be attached.

Further, as shown in FIG. 2, the mounting plates 32, 32 are fixed so as to hang down one by one at the position where the main frame 19 is bent from the horizontal direction to the height direction in an arc. A rear axle transmission case 33 made of a cylindrical steel pipe extending in the lateral direction of the machine body is welded and fixed to the lower ends of these mounting plates 32. A drive shaft 35 for transmitting the power from the transmission case 16 is connected to a substantially central portion of the rear axle transmission case 33,
Rear axle cases 36 are attached to the left and right ends of the transmission case 33, respectively. And the rear axle case
The rear wheels are attached to the shafts 34, 34 that project laterally from the left or right from 36.
3,3 are installed.

Further, as shown in FIG. 1 and FIG. 2, the working unit lifting device for vertically moving the working unit 11 mounted on the rear portion of the machine body extends horizontally on the left and right main frames 19a, 19b. It has a cylinder mounting plate 37 that is fixed so as to bridge both frames 19a, 19b near the center of the part,
A base 39a of a hydraulic cylinder 39 is rotatably connected to the mounting plate 37. Further, the front end portion 39b of the hydraulic cylinder 39 is extended toward the rear of the machine body and connected to the upper link 10a of the parallel link device 10, and the working unit 11 is freely controlled to move up and down as the cylinder 39 expands and contracts. .

Further, as shown in FIG. 3, a step frame 40 composed of a substantially rectangular frame is fixedly provided on the upper part of the main frame 19, and a pipe is bent in a U-shape on the left and right outside of the step frame. The sub-step 41 is fixed.

Since the present embodiment is configured as described above, it is not necessary to attach a seat frame as a separate member on the main frame 19, the main frame 19 itself also serves as a seat frame, and the upper end of the main frame 19 is Each is laterally expanded laterally and a top plate cover with high rigidity is placed on top
Since 20 is fixed and used as a strength member of the main frame 19, not only a through member is unnecessary, but also the main frame 19 having strength is obtained. In addition, further main frame 19
Also serves as a seat frame, reducing the number of parts,
For this reason, a space is created around the seat, a storage place for the battery is generated, and the structure is simple, so that the assembling property of the machine body is improved, and the bending process does not concentrate stress, and the strength is also improved.

Further, the base portion 39a of the hydraulic cylinder 39 is the main frame 19
Since it is connected to the cylinder mounting bracket 37 bridged between a and 19b, the working unit 11 can be sufficiently moved up and down even if the cylinder stroke is short. In addition, since it is not necessary to perform a molding process to pass the fulcrum shaft for the hydraulic cylinder 39 to the mission case 16, the manufacturing cost is reduced and the mission case 16 does not need to be connected to the hydraulic cylinder 39. Can be placed in a section, so that the step surface can be widened.

[Brief description of drawings]

FIG. 1 is a side view of a riding rice transplanter according to the present invention. Second
The figure is a side view of the main part of the riding rice transplanter, FIG. 3 is a plan view of the main part of the riding rice transplanter, and FIG. 4 is a rear view of the main part of the riding rice transplanter. 1 …… Passenger working machine (passenger rice transplanter), 11 …… Working unit, 16…
… Mission case, 19 …… Main frame, 37 …… Cylinder mounting bracket, 39 …… Hydraulic cylinder, 39a ……
Base of hydraulic cylinder, 39b ... Tip of hydraulic cylinder.

Claims (1)

(57) [Scope of utility model registration request] 1. A riding work machine in which a working unit mounted on a rear portion of a machine body is vertically movable by a hydraulic cylinder, and a mission case is arranged at a front portion of the machine body, and two mission cases are spaced from each other. Main frames arranged in parallel and extending rearward are connected to each other, a cylinder mounting bracket is bridged between the main frames, the base of the hydraulic cylinder is rotatably connected to the cylinder mounting bracket, and the tip thereof is connected. A working unit elevating / lowering device for a riding working machine, characterized in that the unit is extended to the rear of the machine body and connected to the working unit.