JP2002027806A - Running gear for four-wheeled implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a running gear for a four-wheeled implement that is equipped with a mechanism for readily going over a ridge by allowing the gear to float up the front wheels higher than the ridge. SOLUTION: This four-wheeled implement is equipped with a rotatable linking rod 72 laid horizontally on the front of the machine body 2 of the running gear and the base parts of the front wheel-supporting arms 14, 14 are fixed to both of the left and right edges of the linking rod 72 and the front wheels 13, 13 are put on the lower edges of individual wheel-supporting arms 14, 14. In this working machine, rotary pieces 73, 73 are fixed to the linking rod 72, the rotary pieces 73 are each linked through a swing rod of a certain length 75 to the machine body of the running gear 2 and the linking rod is linked to the hydraulic cylinder 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique related to ground work of a four-wheel traveling work machine such as a walking type vegetable transplanter, and more particularly, to a mechanism for flipping up a front wheel at the time of traveling or the like.

[0002]

2. Description of the Related Art Conventionally, a transplanting operation has been carried out by a walking type vegetable transplanter. The vegetable transplanter has a front wheel supporting shaft which is rotatably mounted on a front portion of a traveling machine body, and a left and right of a front wheel supporting shaft. Fix the base of the front wheel support arm at both ends, attach the front wheel to the lower end of each front wheel support arm, and support the left and right rear wheels at the end of the transmission case, and rotatably support the other end. Connecting the transmission case and the front wheel support arm via a connecting rod,
Then, the connecting piece was fixed to the front wheel spindle, the connecting piece was connected to the hydraulic cylinder, and the hydraulic cylinder was expanded and contracted to raise and lower the front wheel and the rear wheel so that the aircraft could be raised and lowered. .

[0003]

In the vegetable transplanter constructed as described above, when transplanting vegetable seedlings, when the planting of one ridge is completed and the next ridge is transferred, the hydraulic pressure is reduced. Activate the cylinder to lower the front and rear wheels to raise the fuselage, push down on the steering wheel and raise the front of the fuselage to change direction. However, the front wheel is still lowered, and even when trying to cross the ridge, the front wheel may be caught and break the ridge. Therefore,
It is an object of the present invention to provide a four-wheel traveling working machine that improves the above-described prior art and allows the front wheels to be flipped up with a simpler mechanism so that the ridge can be easily crossed.

[0004]

The above is the problem to be solved by the present invention. Next, means for solving the problem will be described. In other words, a walker in which a front wheel support shaft is rotatably mounted on the front part of the traveling body so as to be freely rotatable, base portions of front wheel support arms are fixed to both left and right ends of the front wheel support shaft, and front wheels are attached to lower ends of the front wheel support arms. In the four-wheel traveling work machine of the type, the front wheel support shaft is connected to an actuator so as to be slidable back and forth, a turning piece is fixed to the front wheel support shaft, and the operation of the actuator is performed using the turning piece as a turning fulcrum. Thereby, the front wheel is configured to be rotatable up and down.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a side view showing the configuration of the vegetable transplanter, FIG. 2 is a side view showing the same frame configuration, and FIG.
FIG. 4 is an inner side view showing a configuration of a front wheel bouncing mechanism according to the present invention, FIG. 4 is a side view of a soil covering wheel showing adjustment of a planting depth by an automatic hydraulic control device, and FIG. 5 is a planting depth according to the present invention. It is a side view of the earth covering wheel which shows adjustment of height.

In the vegetable transplanter 1 shown in FIG. 1, vegetable seedlings such as lettuce, cabbage, and broccoli are grown in the seedling tray 21 and uniform healthy seedlings are set in the vegetable transplanter 1 as they are in the seedling tray 21. It is configured to perform from seedling collection to transplantation.

As shown in FIGS. 1 and 2, the vegetable transplanter 1 is provided with a seedling 2 on a ridge 10 at the rear of a self-propelled traveling body 2.
0, a seedling supply mechanism 4 for supplying the seedlings 20 to the planting mechanism 3, a seedling transfer mechanism 5 for transferring the seedlings 20 to the seedling supply mechanism 4, and a top surface of the ridge 10. A multi-cut mechanism 6 for forming an opening 60a for planting seedlings is provided in the multi 60.

In this way, the vegetable transplanter 1 forms the opening 60a in the mulch 60 by the multi-cut mechanism 6 while traveling the field by the traveling body 2, and transplants the seedlings 20 into the opening 60a by the planting mechanism 3. I have to. However, the multi-cut mechanism 6 may not be provided.

The traveling body 2 has a pair of left and right front wheels 13 attached to a front portion of a traveling frame 12 via front wheel support arms 14, respectively, and has a pair of left and right driving wheels at a rear portion of the traveling frame 12. The rear wheels 15, 15 are mounted via transmission cases 16, 16, respectively.
The rear wheels 15, 15 and the front wheels 13, 13 on both the left and right sides are configured to be vertically adjustable by vertically moving up and down by a vertical position adjusting means 8. The front wheels 13, 13 are provided with a flip-up mechanism 7, which will be described later, so that the front wheels 13, 13 can be rotated back and forth. Reference numeral 18 shown in FIG. 2 denotes a prime mover, which transmits power to the rear wheels 15, the planting mechanism 3, and the like via a transmission mechanism 19. Reference numeral 31 denotes a covering ring, and 32 denotes a covering ring support arm. As shown in FIG. 1, a pressure reducing roller 38 that rolls on the upper surface of the ridge 10 to reduce the pressure on the upper surface of the ridge 10 is provided below the front portion of the traveling body 2.

The traveling machine body 2 extends a support frame 22 for supporting the planting mechanism 3, the seedling supply mechanism 4, the seedling transport mechanism 5, and the multi-cut mechanism 6 toward the rear of the machine body. A base end of a handle frame 23 is attached to a rear end of the support frame 22, and an operation unit 24 to which various operation levers are attached is provided at a tip of the handle frame 23.

The seedling transport mechanism 5 is formed at the rear end of the support frame 22 so as to be inclined from the front lower part to the rear upper part of the body, and accommodates a plurality of seedlings 20 in a pot arranged in a grid. The seedling tray 21 is sequentially moved by a vertical transport device that transports the seedling tray vertically from the rear upper portion to the front lower portion, and a horizontal transport device that transports the vertical transport device horizontally in the left-right width direction. ing.

The seedling supply mechanism 4 is disposed immediately in front of the seedling transport mechanism 5, and has a bifurcated seedling removal claw (not shown) interlockedly connected to a displacement moving device interlocked with the prime mover 18. The seedlings 20 are taken out from the seedling tray 21 by the seedling take-out nails, and the seedlings 20 are supplied to the planting mechanism 3.

The planting mechanism 3 is provided with an opening device 27 comprising a pair of front and rear opening pieces 26 by the displacement moving device.
Is reciprocated up and down such that the tip thereof draws a vertical elliptical locus 28, and at the lower end portion of the vertical elliptical locus 28, the aperture pieces 26 are expanded in the front-rear direction and supplied from the seedling supply mechanism 4. The seedlings 20 are planted in the ridges 10.

The multi-cut mechanism 6 includes a multi-cut device 61 for forming an opening 60 a for planting seedlings in a multi 60 that covers the upper surface of the ridge 10.
And an elevating device 62 for elevating the elevating device.

Next, the flip-up mechanism 7 for the front wheels 13 according to the present invention will be described. As shown in FIGS. 1 and 3, the upper ends of the left and right front wheel support arms 14 are connected by a connecting rod 72, and the connecting rod 72 is mounted between the left and right sides of the traveling frame 12 in a slidable manner. Rotating pieces 73, 73 are erected from both left and right sides of the connecting rod 72,
The upper ends of the turning pieces 73 are used as pivot points 74, 74 to pivotally connect the front ends of the swing rods 75. The swing rods 75 have a fixed length, and their rear ends are attached to rotating pieces 76, 76 erected from the upper ends of the transmission cases 16, 16. The connecting rod 72 is connected to a lifting cylinder via a stay at the left and right central portions of the connecting rod 72, and the connecting rod 72 is rotated by extending and retracting the lifting cylinder, so that the front wheel supporting arm 14
, And at the same time, the rear wheel 15 is moved up and down through the rotating piece 73, the swing rod 75, the rotating piece 76, and the transmission case 16.

Further, a hydraulic cylinder 70 is fixed as an actuator between the left and right of the traveling frame 12, and its cylinder rod 71 is slid in the front-rear direction so that the front end of the cylinder rod 71 and the connecting rod 7
And 2.

When the jumping-up mechanism 7 is constructed as described above, and when the planting of one ridge 10 is completed and the process moves to the planting of the adjacent ridge 10, the operator needs the front wheels 13 and 13 and the rear wheels 15.1.
5 is rotated downward to raise the traveling body 2. Next, an operation lever (not shown) for the flip-up mechanism 7 provided on the operation section 3 is operated. Then, the hydraulic cylinder 70 is operated to slide the cylinder rod 71 rearward, and the turning pieces 73, 73 around the turning fulcrums 74, 74 at the front ends of the swing rods 75, 75 are moved counterclockwise as shown in FIG. While rotating in the direction, the connecting rod 72 is pulled backward. Then, the front wheels 13 are pivoted slidably in the counterclockwise direction, and the front wheels 13 are pivoted rearward and upward. As a result, the front wheels 13
13 goes up. In this state, the handle frame 23 of the operation unit 3 is pushed down, and the rear wheels 15 are driven to move to the adjacent ridge 10. At this time, since the front wheel is lifted, it is possible to easily get over the ridge.

Further, by configuring the flip-up mechanism 7 as described above, the structure is simplified and the cost can be reduced. In addition, when the hydraulic cylinder 70 is used, a storage space for the hydraulic hose can be easily secured, so that the hose can be easily handled and can be arranged in a good-looking design. The flip-up mechanism 7 can be provided not only in the vegetable transplanter 1 described above but also in other walking-type four-wheel traveling working machines.

Next, a method of adjusting the planting depth of the vegetable transplanter 1 will be described. As shown in FIG. 4, soil covering frames 39, 39 extend rearward from pivot points 40, 40 on both left and right sides of the support frame 22.
A fulcrum shaft 41 is mounted between the rear portions of the fulcrum shaft.
Two left and right covering earth support arms 32 extend further rearward, and the covering earth rings 31 are pivotally supported at the rear ends of the covering arm support arms 32, 32, respectively. At this time, the earth cover 31
31 is located behind the multi-cut mechanism 11.

A vertical rod 33 is erected from the left and right middle of the fulcrum shaft 41, the upper end of the vertical rod 33 is used as a pivot point 42, and the horizontal rod 34 is disposed behind the pivot point 42. . At this time, the pivot point 40 of the covering frame 39 is arranged on the extension of the horizontal rod 34. At this pivot point 40, a sensor 49 for detecting the height is arranged,
In conjunction with the vertical position adjusting means 8 of the front wheel 13 and the rear wheel 15, the vertical position adjusting means 8 is driven to control the unevenness of the ridge 10 so that the planting depth is constant. The rear end of the horizontal rod 34 is a pivot point 43, and the operation rod 35 is erected from the pivot point 43. Then, a fulcrum shaft 44 is suspended between the left and right handle frames 23, the upper end of the operating rod 35 is connected to the fulcrum shaft 44, and the operation lever 36 is moved rearward from the connection point.
Is arranged.

Further, by turning the operation lever 36 up and down, the covering soil rings 31 are moved up and down to adjust the planting depth. That is, as shown in FIG. 5, when the operation lever 36 is rotated upward, the operation rod 35 around the fulcrum shaft 44 below the handle frame 23 is viewed from the side in FIG.
Rotating in the counterclockwise direction, the horizontal rod 34 is pulled backward. As a result, the upper end of the vertical rod 33 is also pulled rearward, and the vertical rod 33 rotates clockwise about the fulcrum shaft 41, and with the movement thereof, the earth covering ring support arm 32
Also rotates clockwise. Due to the reaction force due to the downward pressing, the soil covering frame 39 is rotated upward about the pivot point 40. A value from the sensor 49 is input to the controller in response to the upward rotation, the vertical position adjusting means 8 is operated, the front wheel 13 and the rear wheel 15 are lowered, the body is raised, and the planting mechanism is raised. The planting depth becomes shallower.

In such a configuration, since the turning direction of the operating lever 36 and the vertical direction of the elevation of the planting mechanism 3 coincide with each other, it is easy for the operator to determine the depth of the planting depth. Operability is improved. The operating lever 36 can be disposed at an appropriate position between the left and right sides of the fulcrum shaft 44.
The arrangement position between the positions 23 can be changed forward or rearward and upward, and the operation lever 36 can be attached to a place where operation is easy. Further, the operating lever 36 absorbs the vertical swing of the earth covering frames 39, 39 by the automatic hydraulic control device at the horizontal rod 34 and the pivot points 42, 43 at both ends thereof. The operability can be improved without swinging.

[0023]

As described above, the present invention has the following advantages. That is, claim 1
A front wheel support shaft is rotatably mounted on the front part of the traveling body, and the base of the front wheel support arm is fixed to the left and right ends of the front wheel support shaft, and the front wheel is attached to the lower end of each front wheel support arm. In the walking type four-wheel traveling working machine, the front wheel support shaft is connected to an actuator so as to be slidable back and forth, a turning piece is fixed to the front wheel support shaft, and the actuator is used as the turning piece as a turning fulcrum. , The front wheel is configured to be able to move up and down, whereby the structure is simpler than that of a mechanism that expands and contracts the rod of the actuator, and the cost can be reduced. Further, when a hydraulic cylinder is used as an actuator, a storage space for the hydraulic hose can be easily secured, so that the hose can be easily handled, and can be arranged in a good-looking design. Is caused.

[Brief description of the drawings]

FIG. 1 is a side view showing the configuration of a vegetable transplanter.

FIG. 2 is a side view showing the same frame configuration.

FIG. 3 is an inner side view showing a configuration of a front wheel flip-up mechanism according to the present invention.

FIG. 4 is a side view of the earth covering wheel showing adjustment of the planting depth by the automatic hydraulic control device.

FIG. 5 is a side view of an earth covering wheel showing adjustment of a planting depth according to the present invention.

[Explanation of symbols]

 Reference Signs List 2 traveling machine body 7 flip-up mechanism 12 traveling frame 13 front wheel 14 support arm 15 rear wheel 70 hydraulic cylinder 72 connecting rod 73 rotating piece 75 swing rod

Continuing from the front page (72) Tomohiro Takeyama 1-32 Chayacho, Kita-ku, Osaka-shi, Osaka Prefecture Inside Yanmar Agricultural Machinery Co., Ltd. Agricultural machinery F term (reference) 2B060 AC01 AD04 BA03 CA03 2B063 AA14 AB02 AB06 AB08 BA07 BA13 CA03 3D050 AA12 AA14 BB01 DD01 EE08 EE15 FF04 GG06 KK13

Claims (1)

[Claims] 1. A front wheel support shaft is rotatably mounted on a front portion of a traveling vehicle body, and bases of front wheel support arms are fixed to left and right ends of the front wheel support shaft, and a front wheel is provided at a lower end of each front wheel support arm. In the mounted walking type four-wheel traveling work machine, the front wheel support shaft is connected to an actuator so as to be slidable back and forth, a turning piece is fixed to the front wheel support shaft, and the turning piece is used as a turning support point. A traveling device for a four-wheel traveling work machine, wherein a front wheel is configured to be rotatable up and down by actuation of an actuator.