JPH0216906A - Walking type working machine for use in paddy field - Google Patents

Abstract

PURPOSE:To control space for a connecting mechanism low by making constitution wherein a balance arm is linked and connected to an arm of transmission case base and the transmission case is rocked downward and operated by projecting movement of a piston rod to the front of a machine. CONSTITUTION:A first hydraulic cylinder 6 is supported in a frame 2 positioned at a front part of a machine ahead of a transmission case 5 in a state of a piston rod 6a facing the front of part of a machine and a first balance arm 7 is rockingly fixed to the front end of the piston rod 6a. Connecting rods 10 ranging from both left and right sides of the first balance arm 7 to lower ends of left and right balance arms 9 are set at left and right sides of the frame 2 and connecting rods 11 ranging from an arm 5a of the transmission case 5 to the top of a second balance arm 9 are laid. Projecting movement of the piston rod 6a to the front part of a machine is, without being converted into a vertical movement, transmitted to the transmission case and the height of a machine is controlled low.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a walking rice paddy working machine represented by a walking rice transplanter, and particularly to a vertical movement structure of wheels.

[Conventional technology]

A walk-behind rice transplanter, which is a type of walk-behind paddy field work machine, has a structure that keeps the height of the machine above the rice field constant by driving the wheels that run on the tiller up and down. A structure in which the transmission case extends rearward from the mission case at the front of the fuselage, and wheels are provided at the rear end of the transmission case to drive the transmission case to swing up and down at the connection point with the mission case. There is something.

In this way, the reason why the wheels are placed close to the rear of the machine is that the rear of the walking rice transplanter is equipped with a planting device consisting of a seedling stand and a planting arm, which makes it easier for the planting operation. Sometimes, many seedlings are placed on the seedling stand and the rear of the aircraft becomes heavy, causing the aircraft to tend to descend backwards. At the same time, when moving forward, reverse torque from the wheels causes the aircraft to further descend. This is to prevent this.

[Problem to be solved by the invention]

In the case of the above-mentioned structure, when the transmission case is swung downward, the wheels move downward and at the same time move forward of the aircraft, weakening the effect of preventing the backward downward tendency as mentioned above.
For example, as disclosed in Japanese Utility Model Publication No. 6228810, a hydraulic cylinder for driving the transmission case up and down is arranged on the front side of the transmission case that supports wheels, and the piston rod in this hydraulic cylinder is moved forward to move the transmission case. Some devices are configured so that they can be swung downwards.

With this disclosed structure, the piston rod and the interlocking system from the piston rod to the transmission case move forward as the transmission case swings downward.
It is possible to prevent the backward downward tendency caused by the forward movement of the wheels due to the downward swinging operation of the transmission case.
The structure is such that the longitudinal movement of the piston rod is converted into vertical movement by a bell crank, and the transmission case supporting the wheels is driven to swing up and down.

In this way, if you try to install a spare seedling stand on the top of the machine (above the space where the bell crank can move) while ensuring space inside the machine for the bell crank to swing up and down, the position of the spare seedling stand will change. It ends up being expensive,
This spare seedling stand obstructs the forward view of the operator standing at the rear of the aircraft, and increases the center of gravity of the aircraft.

The present invention was developed by focusing on the above-mentioned problem, and although it is equipped with a vertically swinging structure for wheels that suppresses the tendency of the aircraft to descend backwards, it does not require the use of an upper structure such as a spare seedling stand. The purpose is to ensure that objects do not obstruct the driver's forward vision.

[Means to solve the problem]

The feature of the present invention is that the walking type paddy field work machine as described above is configured as follows.

In other words, a wheel is provided at the swinging end of a transmission case that extends rearward so as to be able to swing downwards about the front end fulcrum, and a hydraulic cylinder is mounted on the front side of the transmission case, with its piston rod extending toward the front of the machine. and an arm extending upward from the base of the transmission case, one end of the balance arm and the piston rod disposed between the piston rod and the arm, and the other end of the balance arm. The transmission case is operatively connected to the arm so that the transmission case is swung downward by the protruding movement of the piston rod toward the front of the machine body, and its functions and effects are as follows.

[For production]

With the configuration described above, the protruding movement of the piston rod toward the front of the aircraft body is converted by the balance arm into a movement toward the rear of the aircraft body, and the arm of the transmission case that supports the wheels is pushed toward the rear of the aircraft body, causing the transmission case to move downward. It will be operated by swinging. That is, the protruding motion of the piston rod toward the front of the machine body can be transmitted to the transmission case as a longitudinal motion without being converted into a vertical motion midway through, and can be swung downward.

〔Effect of the invention〕

As described above, it has become possible to link the piston rod of the hydraulic cylinder to the transmission case of the wheel without any vertical movement, and it has become possible to keep the space for this linkage mechanism low. Even if a structure such as a stand for standby seedlings is provided, the height can be kept relatively low.

Furthermore, since the transmission case is swung downward by the movement of the piston rod in the hydraulic cylinder protruding toward the front of the machine body, the advantages of the conventional structure disclosed in A-A remain intact.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A walk-behind rice transplanter, which is one embodiment of the present invention, will be described below with reference to the drawings.

As shown in Figures 1 and 2, an eight-body front engine frame (2) extends from a mission case (1) placed in the left and right center of the front side of the aircraft, and the engine (2) is attached to this engine frame (2). 3) is installed, and a transmission case (5) equipped with wheels (4) extends from the mission case (1) to the rear of the aircraft, and rotates up and down around the horizontal axis (Pl), which is the fulcrum of its front end. The transmission case (5
) is supported.

On the other hand, inside the engine frame (2) located on the front side of the aircraft from the transmission case (5), there is a single-acting type first hydraulic cylinder (6) with its piston port (6a) facing the front of the aircraft. The piston rod (6a)
A first balance arm (7) is attached to the front end of the lever so as to be able to swing freely around the vertical axis (P2), and a double-acting type first balance arm (7) is attached to the front end of the Two hydraulic cylinders (8) are installed.

A second balance arm (9) that can swing freely around the horizontal axis (P3) is provided on the left and right sides of the engine frame (2). The connecting rod (10
) is installed at the base of the transmission case (5) (near the horizontal axis (P, )) and the upper end of the second balance arm (9) and the arm (5a) that is erected toward the top of the machine. A connecting rod (11) is installed across the bridge. Also, the connecting rod (1
1) is provided with a plurality of connecting holes (11, a) so that the length of the connecting rod (11) can be adjusted by changing the connecting position to the balance arm (9).

With the above structure, when the piston rod (6a) in the first hydraulic cylinder (6) is extended to protrude forward of the aircraft, the left and right transmission cases (5) are swung downward, and conversely, the piston rod (6a) in the first hydraulic cylinder (6) is operated to swing downward. When the hydraulic cylinder (6) is contracted, the left and right transmission cases 5) are swung in one direction. Also, by expanding and contracting the second hydraulic cylinder (8), the first balance arm (7) is aligned with the vertical axis (P2).
The left and right transmission cases (5) are pivoted vertically in opposite directions.

As shown in FIG. 1, a center float (12) is supported at the center of the aircraft body, which is movable up and down and can be rolled. Based on the up and down movement of the center float (12), the first hydraulic cylinder (6) A control valve (not shown) is operated, and the above-mentioned manual operation of the transmission case (5) is performed to maintain the aircraft at a constant height above the circular surface.

Also, based on the low link operation of (center flow) (12), the left and right tilt of the machine body with respect to the field surface is detected, and the control valve (not shown) for the second hydraulic cylinder (8) is operated to perform the transmission as described above. The case (5) is moved up and down in a contradictory manner, keeping the aircraft parallel to the rice field.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the walking type paddy field work machine according to the present invention,
Fig. 1 is an overall side view of the walking rice transplanter, and Fig. 2 is a cross-sectional plan view of the vicinity of the transmission case and engine frame. (4)...Wheel, (5)...Transmission case, (5a)...Transmission case arm, (6)...
... Hydraulic cylinder, (6a) ... Piston rod of hydraulic cylinder, (9) ... Balance arm.

Claims (1)

[Claims] A transmission case (5) extends rearward so as to be able to swing up and down about a front end fulcrum, and wheels (4) are provided at the swinging end of the transmission case (5), and a hydraulic cylinder (6) is provided on the front side of the transmission case (5) ) is arranged so that its piston rod (6a) protrudes forward of the fuselage, and an arm (5a) extends upward from the base of the transmission case (5), and the piston rod (6a)
a) and the arm (5a).
) and the piston rod (6a), and the other end of the balance arm (9) and the arm (5a) are interlocked and connected, and the transmission case ( 5) A walking type paddy field work machine which is configured to be operated to swing downward.