JPH02310183A - Agricultural machine - Google Patents

Abstract

PURPOSE:To shorten the whole length of an agricultural machine and improve th weight balance by longitudinally arranging a hydraulic cylinder for driving a link type lifting device liftably supporting a machine portion on the side of an engine. CONSTITUTION:The machine portion of an agricultural machine is fitted to a lifting link device 3 arranged behind a riding running vehicle body. A frame body 42 is erected on a chain case 15, the upper and lower links are supported on the frame body 42, and a connecting frame 45 is fitted to rear end sections of the upper and lower links 43 and 44 to constitute a lifting link device 3. The upper link 43 is connected to the piston rod 32a of a hydraulic cylinder 32 via an arm 48 and a joint member 49. The hydraulic cylinder 32 is arranged longitudinally horizontally on one side of an engine 20 mounted on a main frame 7. The whole length of the agricultural machine is shortened, and the weight balance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an agricultural working machine in which a part of the working machine for rice planting or the like is supported in a vertically movable manner by a link-type lifting device provided at the rear of a traveling vehicle body.

[Prior Art] A lifting device for a working machine part provided in an agricultural machine for paddy fields such as a rice transplanter is a 1L lower part whose base side is pivoted to the traveling vehicle body and the working machine part is attached to the free end side. It has a pair of links, and is configured to move the working machine portion up and down by rotating the links up and down.

Conventionally, a hydraulic cylinder for driving a lifting device has been provided facing rearward from the rear end of a traveling vehicle body, and the upper link has been directly rotated by the hydraulic cylinder.

[Problems to be Solved by the Invention] For this reason, conventional agricultural machines for paddy fields require space for arranging a hydraulic cylinder at the rear end of the traveling vehicle body, and this space for arranging the hydraulic cylinder is insufficient. This was an obstacle to shortening the overall length.

[Means for Solving the Problems] In order to solve the above problems, the present invention has the following configuration.

That is, in the agricultural machine according to the present invention, a link type lifting device is provided at the rear of a traveling vehicle body in which an engine is disposed at an intermediate portion between a front wheel axle and a rear wheel axle in the traveling direction, and the working machine part is raised and lowered by the lifting device. The agricultural machine is characterized in that a hydraulic cylinder for driving the lifting device is provided on either side of the engine in the front-rear direction.

[Function] Since the hydraulic cylinder for driving the lifting device is installed on the side of the engine, there is no need for space to place this hydraulic cylinder at the rear end of the vehicle body, which reduces the overall length of the agricultural machine. can be made shorter and more compact.

[Example] Figs. 1 to 5 show a rice transplanter as an example of the present invention, and this rice transplanter 1 is used for rice planting work on a lifting gear N3 provided at the rear of a passenger vehicle body 2. Machine part 4 is attached.

In the traveling vehicle body 2, a connecting frame 6 that is horizontally U-shaped in side view is provided at the rear of a main transmission case 5 disposed at the front of the vehicle body, and a differential case 9 is housed within the connecting frame. Left and right front axle cases 10.10 project outward from both side surfaces of the differential case 9, front wheel support cases 11.11 are vertically installed at the ends of the left and right front axle cases 10.10, and left and right front wheels 12.10 are attached to the lower ends of the front wheel support cases. 12 are each pivotally supported. Further, a front end portion of a main frame 7 extending rearward is fixedly connected to the rear side portion of the connecting frame 6;
A rear axle case 13 is provided at the rear end of the main frame 7 and is formed by integrally molding a side clutch case and a rear axle case. Chain cases 15 and 15 are attached rearward to both left and right ends of the rear case 13, and rear wheels 16 and 16 are each pivotally supported at the rear ends.

The engine 20 is installed on the L of a bracket (21.21) fixed to the main frame 7, slightly to the left or right side (left side in the illustrated example) from the center of the vehicle body. The rotational output of the engine is transmitted forward through a transmission shaft 23, and at the front end of the transmission shaft is a transmission device 24 that also serves as a clutch and an auxiliary transmission.
The transmission is transmitted to the mission case 5 via. 26 in the diagram
27 is a rear case drive shaft that transmits the rear wheel drive output taken out from the transmission case 5 to the rear case 13;
This is a working unit drive shaft that transmits information to the O-axis 28. In addition, the transmission shaft 2
3 is also transmitted by a belt 30 to a hydraulic pump of a hydraulic assembly 31 provided on the right side of the engine 20. Below this hydraulic assembly 31, that is, on the right side of the engine 20, a hydraulic cylinder 32 for driving an elevating link device, which will be described later, is fixed substantially horizontally in the front-rear direction. The hydraulic assembly 31 is an assembly of a pump 34, a tank 35, a valve 36, etc., as shown in FIG.

The elevating link device 3 includes a frame body 42 which is gate-shaped in rear view and is erected on a plywood board 40 which is constructed on the chain case 15°15.
and an upper link 43 and a lower link 4 supported by the frame.
4, and a connecting frame 45 which is attached to the rear end of the upper and lower links and has a lower end to which a working machine part is attached. The upper link 43 is attached to a post 47 that is integral with a shaft 46 supported by the frame 42. A right end portion 46a of the bossed shaft 46 projects outward from the frame 42, and an obliquely downwardly directed arm 48 is integrally provided at this portion. The tip of the arm 48 is connected to the piston rod 32a of the hydraulic cylinder 32 via a joint member 49 made of a chain link. When the hydraulic cylinder 32 is expanded or contracted, its back-and-forth motion is converted into rotational motion via the joint member 49 and arm 48, and the vertical links 43, 44 are rotated up and down. Therefore, the connecting frame 45 moves up and down while being maintained in a constant posture. The easy hand member 49 is provided to relieve vertical displacement of the tip of the arm 48 due to rotation, and by interposing this member, it is possible to fix the hydraulic cylinder 32. Although a commercially available chain link is used as the joint member in the embodiment, other links may be used as long as both ends are rotatably connected to the arm 48 and the rod 32a, respectively. In addition,
The hydraulic cylinder 32 and the hydraulic assembly 31 are attached to a connecting member 49 extending between the transmission case 5 and the frame 42 in the longitudinal direction. Further, the working portion drive shaft 27 is disposed between the connecting member 49 and the engine 20.

As described above, since the hydraulic cylinder 32 for driving the lifting device is provided on the side of the engine, it is easier to arrange the hydraulic cylinder than in a case where the hydraulic cylinder is provided at the rear end of the vehicle body. The total length of the agricultural machine can be shortened by the space required.

Furthermore, since the hydraulic cylinder is located at the front, the center of gravity of the aircraft moves forward by that amount, resulting in a favorable weight balance.

Next, to explain the working machine part 4, a transmission case 50 transmits power from the traveling vehicle body side via the PTO shaft 28.
A seedling stand 51 is installed above the transmission case so that the front side is on top, and a planting claw 52a for holding the seedlings is provided at the tip. It is equipped with a planting rod 52 that can take out the seedlings on the seedling stand 51 one by one and plant them in the field while moving, and a pair of left and right flows h55.55 are installed on the lower side of the transmission case 50. It is pivotably mounted at the bottom. At the front of the float
A rod 57 for detecting downward movement is attached, and when the float moves upward, the movement is transmitted to the valve of the hydraulic assembly 31, which extends the hydraulic cylinder 32 and lifts the work implement part 4, and conversely causes the float to move downward. When the hydraulic cylinder 32 is moved, the hydraulic cylinder 32 is contracted and the lifting control is performed to lower the work implement section 4.

[Effects of the Invention] As explained above, the agricultural machine according to the present invention can be made compact in overall length by having the hydraulic cylinder for driving the lifting device installed on the side of the engine. At the same time, the center of gravity of the aircraft was moved forward, resulting in a more favorable weight balance.

[Brief explanation of the drawing]

FIG. 1 is a side view of one example of the agricultural machine according to the present invention, and FIG.
3 is a plan view thereof, FIG. 4 is a rear view thereof, and FIGS. 5(a) and 5(b) are a side view and a rear view of the hydraulic assembly. 1... Rice transplanter (Ijk working machine), 2... Traveling vehicle body,
3... Lifting link device, 4... Work equipment part, 5...
・Mission case, 20...Engine, 31...
Hydraulic assembly, 32... Hydraulic cylinder, 43...
Upper link, 44...lower link.

Claims (1)

[Claims] (1) In an agricultural working machine in which a link-type lifting device is provided at the rear of a traveling vehicle body in which an engine is disposed at an intermediate portion between a front wheel axle and a rear wheel axle in the traveling direction, and the working machine part is supported in a vertically movable manner by the lifting device. . An agricultural machine, characterized in that a hydraulic cylinder for driving the lifting device is provided on the side of the engine in the front-rear direction.