JPH0415522Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is based on a system in which the tip of a piston rod of a hydraulic cylinder, which is installed in an airframe with a difference in weight balance in the left and right directions, is movable back and forth along the axis of the rod. At the same time, a sliding member is attached, and the center of an arm that can swing freely around the axis along the vertical direction of the aircraft is pivotally connected to this sliding member, so that the left and right ends of the arm can swing vertically independently. The left and right wheel transmission cases are linked to each other, and both wheel transmission cases are configured to be able to freely swing up and down in a contralateral manner, and a suspension spring is interposed between the piston rod and the arm to bias the arm toward the wheel lowering side. The present invention relates to a wheel support structure for a walking-type rice transplanter, and more specifically, to a suspension structure for balancing the weight in the left-right direction of the machine.

[Conventional technology]

Conventionally, the applicant has developed and filed an application for the suspension structure described below.

In other words, as disclosed in FIG. 3 of the embodiment in Utility Model Application No. 58-32558, one suspension spring is provided on each side of the piston rod to be interposed between the piston rod and the swinging member. This configuration uses two suspension springs with different spring constants to balance the weight balance between the left and right sides of the aircraft.

[Problem that the invention attempts to solve]

However, in the conventional configuration, it is difficult to adjust the balance after the suspension springs are installed, and the use of springs with different characteristics increases the number of parts and costs, leaving room for improvement.

The present invention has been developed in view of the above-mentioned circumstances, and has an object to provide a suspension structure that allows adjustment of the left-right balance of the aircraft with a small number of parts through reasonable modification.

[Means for solving problems]

The feature of the present invention is that the one suspension spring is eccentrically arranged to the left and right sides with respect to the axis, thereby giving a difference in the downward biasing force of the left and right wheel transmission cases. Its actions and effects are as follows.

[Effect]

In other words, since one suspension spring is arranged eccentrically as described above, by setting the arrangement position to be offset to the side where the weight of the machine is greater, the biasing force applied by this suspension spring is reduced. A difference is created between the left and right sides of the arm fulcrum, and this biasing force can be balanced with the weight of the machine that is differentially applied to the left and right ends of the arm from the left and right wheel transmission cases via linkage.

In addition, since there is only one suspension spring, the number of parts is small, and by adjusting the amount of eccentricity of the suspension spring, the weight in the left and right directions of the aircraft can be balanced and the tilt of the aircraft can be eliminated.

[Effect of idea]

Therefore, with a relatively simple configuration in which one suspension spring is arranged eccentrically, the structure is simpler and the number of parts is smaller than that using two springs, and the weight balance can be easily adjusted. Since this adjustment is made by setting the position of the spring, a suspension structure that allows even small adjustments and eliminates the tilting of the aircraft body has been provided at a low cost.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, an engine 1 is mounted at the front of the aircraft body, and a transmission case 3 is drive-connected to the engine 1 at the rear via a belt 2.
Further, left and right running wheels 5, 5 which are driven up and down by a hydraulic cylinder 4 are arranged so as to be drivable from the transmission case 3 via wheel transmission cases 6, 6. A transmission case 7 extends in a cantilevered manner from the left side of the transmission case 3 toward the rear, and at the rear of the transmission case 7 is a seedling stand on which pine-shaped seedlings W can be placed. 8 is equipped to be tilted backward, and three planting arms 9 are provided to take out and plant each pine-shaped seedling W one by one.
... is provided along the lower front edge of the seedling stand 8. In addition, the base end portions of a pair of left and right handle rods 10 are attached to the rear end of the transmission case 7, and three floats 11a, 11b, 11b are provided at the lower part of the machine body, thereby creating a three-row walking type rice transplanter. is configured.

In this rice transplanter, the wheel transmission cases 6, 6 are pivotally supported by the transmission case 3 so as to be able to swing independently around the left and right axis Q of the machine body, and the transmission cases 6, 6 and the hydraulic cylinder 4 are connected by a link 12. , 12, and arm 13. That is, a sliding member 14 is attached to the tip of the piston rod 4a of the hydraulic cylinder 4, and is movable back and forth along the rod axis direction. An arm 13 is pivotally connected at its center so as to be movable, and both left and right ends of the arm 13 and the left and right wheel transmission cases 6,
6 are linked via links 12, 12, and the left and right wheels 5, 5 are driven up and down by the drive of the hydraulic cylinder 4, and the independent vertical movement of the left and right wheels due to unevenness of the tiller is controlled by the arm 13. A coiled suspension spring 15 is interposed between the piston rod 4a and the arm 13 to bias the arm 13 toward the lowering side of the wheel.

As shown in FIGS. 3 and 4, the suspension spring 15 is attached by bolting a spring receiving member 17a to a plate 16 fixed to the piston rod 4a so as to be movable in the left and right direction. The receiving member 17b is bolted so as to be movable in the left and right direction, and the respective spring receiving members 17a,
The suspension spring 15 is interposed between the rice transplanter 17b, and if the transmission case 7, handle rod 10, etc. are deviated to the sides of the machine like this rice transplanter, there will be a difference in the weight balance in the left-right direction of the machine. In this rice transplanter, the suspension spring 15 is arranged eccentrically with respect to the axis P in order to balance the weight in the left and right direction of the machine body, and the amount of eccentricity can also be adjusted. It's becoming like that.

In addition, in order to prevent the engine from stopping due to the wheels 5, 5 sinking deep into muddy soil in the field where the rice transplanter is deep, increasing the load on the traveling system, as shown in Fig. 5, When the wheels 5, 5 are lowered, this is detected from the rocking of the wheel transmission case 6, and the pulley 18 is configured to operate the continuously variable speed pulley 18 attached to the output shaft 1a of the engine 1 to the deceleration side. The operating arm Ca of the attached cam C and the wheel transmission case 6 are connected by a rod 19.

The three floats 11a, 11b, 11b
The floats 11b and 11b at the rear are respectively attached to the rear end of the fuselage via telescopic structures 20 and 20 of the pipe frame 19, and the support span is adjusted according to the condition of the muddy soil. I'm starting to be able to do it.

[Another example]

In this embodiment, a coil spring is used as the suspension spring 15, but instead of this, as shown in FIG. 6, a through hole 15a is formed in the shape of a strip plate and a through hole 15a through which the piston rod 4a can be inserted. Alternatively, a flat spring 15 may be used.

[Brief explanation of the drawing]

The drawings show an example of the wheel support structure of the walking rice transplanter according to the present invention, and FIG. 1 is a schematic plan view of the walking rice transplanter with 3 rows, and FIG. 2 is a side view of the walking rice transplanter with 3 rows. , Fig. 3 is a cross-sectional plan view showing details of the arm section, Fig. 4 is a sectional view taken along the - line in Fig. 3, Fig. 5 is a partially cutaway plan view of the engine output shaft section, and Fig. 6 is a suspension view. It is a top view which shows another Example of a spring. 4... Hydraulic cylinder, 4a... Piston rod, 6... Wheel transmission case 6, 13... Arm,
14...Sliding member, 15...Suspension spring, P...Axis center.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Piston rod 4 of a hydraulic cylinder 4 provided in an aircraft with a difference in weight balance in the left and right directions
A sliding member 14 that can freely move back and forth along the rod axis direction is attached to the tip a, and the axis P of the body is attached to the sliding member 14 in a vertical direction.
The center of an arm 13 that can swing freely around the circumference is pivotally connected, and both left and right ends of the arm 13 are linked to left and right wheel transmission cases 6, 6 that can swing vertically independently, and both wheel transmission cases 6, 6 are connected. A wheel support for a walk-behind rice transplanter in which a suspension spring 15 is interposed between the piston rod 4a and the arm 13 to bias the arm 13 toward the wheel lowering side. In this structure, one suspension spring 15 is arranged eccentrically to the left and right sides with respect to the axis P, thereby giving a difference in the downward biasing force of the left and right wheel transmission cases 6, 6. Wheel support structure for a walking rice transplanter. (2) The wheel support structure according to claim 1, wherein the suspension spring 15 is a coil spring fitted onto the piston rod 4a.