JPS5839927Y2 - Mobile agricultural machine with wheel height change device - Google Patents

Description

[Detailed description of the invention] The invention is based on a system in which the support frames for the left and right wheels, each of which is attached to the aircraft body so as to be movable up and down, are pivotally connected to the free end of an arm that can be driven to swing up and down. This invention relates to a mobile agricultural machine in which the vertical heights of the left and right wheels can be changed by vertically swinging the arm.

As an example of this type of mobile agricultural machine with a wheel height changing device, there is a structure shown in Japanese Utility Model Publication No. 51-6413, but in this case, the left and right wheel support frames always swing up and down separately. Because it is flexible, it has the disadvantage that the aircraft's attitude becomes unstable when driving on the road or turning in fields.

Therefore, as shown in Japanese Utility Model Publication No. 50-9229, it has been proposed that a locking mechanism is provided to prevent the left and right wheels from swinging separately if necessary, but in this case,
Since the locking position is set at a constant height of the wheel from the ground, there is a problem in that it cannot be locked freely, especially when used in fields where the plowing depths vary widely.

However, it is actually possible to use a locking means as shown in the above-mentioned Japanese Utility Model Publication No. 50-9229 for a vehicle having a structure in which the height position of the wheel can be freely adjusted. Alternatively, the lock mechanism may be of a lock pin type that is selectively inserted into a locking hole formed in both a seesaw member connected to the swing arm and a fixed frame extending from the aircraft frame. However, in this case, it would be necessary to provide a large number of locking holes on one side, and if the locking holes were formed with small pitches to allow fine adjustment of the wheel height, there would be problems with strength. This results in a high degree of skill in machining the locking holes, and if the pitch is increased, the unit of wheel height position adjustment becomes larger, which has many practical disadvantages.

In view of the above-mentioned circumstances, the present invention provides that even if the locking mechanism is constructed in the lock pin type as described above, it does not cause strength problems and does not require a complicated structure. The purpose of the present invention is to make it possible to securely fix the wheel at a desired height position.

The characteristic configuration of the mobile agricultural machine with a wheel height changing device according to the present invention is that the rotation axis of the arm is oriented in a substantially horizontal lateral direction toward the roadside of the arm that is driven to swing around the horizontal axis on the machine frame side, and , left and right running wheels, in which seesaw members having crank arm portions protruding in opposite directions are pivotally connected so as to be relatively rotatable, and the tips of both crank arms are provided so as to be movable up and down with respect to the aircraft body. The outer fitting member is connected to each support frame via a connecting member, and the seesaw member is provided with an outer fitting member having two projecting pieces having different phases around the rotation axis of the seesaw member. A projecting piece that is attached to the seesaw member so as to be rotatable relative to the seesaw member and protrudes in a direction along one projecting piece on the seesaw member side is provided on the fuselage frame side where the horizontal shaft is provided, and Connecting one protrusion on the seesaw member side and the protrusion on the fuselage frame side with an interlocking member,
A four-row link mechanism is configured in which a protruding piece on the body frame side is a fixed joint, and further, the relative position of the protruding piece and the crank arm is fixed on the other protruding piece on the seesaw member side. and a locking mechanism that can be freely fixed and released, and because of this configuration, even if the wheel height is freely changed, there is almost no change in the phase of both protrusions around the axis of the seesaw member. Therefore, the left and right wheels can be fixed in a predetermined state at any height position with a simple and compact structure that simply fixes the crank arm member of the seesaw part to this protrusion using a locking mechanism. It has come to be effective.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a center float 8A installed in the front part of the fuselage frame I between a center float 8A that can freely swing up and down within a certain range with respect to the fuselage frame 7, and side floats 8B and 8B located on both left and right sides. A pair of left and right transmission cases (support frames) 2,
A pair of left and right wheels 1, 1 which receive power through a wheel 2 are disposed, and at the rear of the fuselage frame 7 there is provided a seedling mount which is tilted from the lower rear to the upper front and is movable back and forth in the left and right lateral directions. A stand 9 and a seedling planting claw 10 that sequentially plants the seedlings taken out from the seedling stand 9 onto the mud surface at the planned planting location.
. . . Also, a rice transplanter is shown in which a seedling planting device 11 is equipped with a planting mission M2 that controls these drives, and the two axles 1.1 are connected to the transmission case 2,
A wheel height changing device 12 that swings up and down relative to the machine body around the input axis 2 is constructed as shown in FIGS. 3 and 4.

That is, on the bracket 13 provided on the body frame 7,
An arm 4, which is roughly L-shaped in side view and is driven around a horizontal axis 14 by a single hydraulic cylinder 3, is pivotally connected to a cylindrical member 4A fixed to the free end of this arm 4Q. a crank arm 15A protruding from both ends in opposite directions;
A seesaw member 15 is rotatably inserted into the seesaw member 15, and a shock absorber 16, which is an example of a connecting member, connects the free ends of the crank arms 15A, 15A and the transmission cases 2, 2, respectively. .16, so that the vertical height of the left and right wheels 1.degree. 1 can be changed freely by vertical swinging of the arm 4 as the cylinder 3 expands and contracts.

The locking mechanism 5, which is provided between the transmission cases 2, 2 and the vertically swinging arm 4 and can be fixed and released, is constructed as follows.

That is, the crank arm 15A is attached to a projecting piece 5A provided on an external fitting member that is rotatable with respect to the end of the cylindrical member 4A that faces one of the crank arms 15A, 15A.
A lock pin 5B that can be fitted and locked into a locking claw 15a formed in the
A cylindrical pin holding member 5C that is fitted and held in a slidable manner is fixed, and the lock bin 5B is placed between the inner surface of the bottom plate of this pin holding member 5C and the back surface of the lock bin 5B.
f A spring 5D that elastically urges the locking direction to be fitted into the locking hole 15a is interposed, and the lock pin 5B and the planting are a control bundle extending rearward and upward from the rear end of the mission M2. Operation lever 5 provided at 18
E is interlocked and connected to the cylindrical member 4A via the operating wire 5F, and when the locking pin 5B is fitted and locked in the locking hole 15a by operating the operating lever 5E, the cylindrical member 4A Projection piece 5A attached to the end of crank arm 1
5A, the projecting piece 5A becomes the seesaw member 15.
The relative positions of the left and right wheels 1, 1 do not change unless they rotate about the axis of the lock pin 5B in the locking hole 15a.
When the lock is released by separating from the crank arm 15A, the left and right wheels 1, 1 can swing in opposite directions by allowing free movement of both crank arms 15A, 15A. Also, by vertically swinging the vertically swinging arm 4 in accordance with the operation of the cylinder 3, the left and right wheels 1, 1 are simultaneously moved up and down in the same direction, and the vehicle height can be adjusted. .

When the vertically swinging arm 4 is vertically swung with the locking mechanism 5 kept in the locked state, the protruding piece 5A is connected to a member externally fitted onto the end of the cylindrical member 4A.
rotates integrally with the cylindrical member 4A, and the seesaw member 1
The parallel rotation link mechanism 6 used as a means for preventing the crank arms 15A, 15A of No. 5 from being rotated in opposite directions is constructed as follows.

That is, the external fitting member on which the protruding piece 5A of the locking mechanism 5 is provided is configured to be rotatable around the axis of the cylindrical member 4A, and the external fitting member on which the protruding piece 5A is provided is , the bracket 13 is provided with another projecting piece 6A with a different phase around the rotation axis of the seesaw member 15, and supports this projecting piece 6A and the vertically swinging arm 4 in a vertically swingable manner. The protruding piece 6B provided on the vertically swinging arm 4 is pivotally connected to the protruding piece 6B through a connecting member 6C, and the above-mentioned protruding pieces 6A and 6B are constituted by the connecting member 6C and a part of the vertically swinging arm 4. Regardless of the vertical swinging of the vertical swinging arm 4, the relative positions of the left and right wheels 1, 1 do not change at all times.

In other words, when the vertically swinging arm 4 is vertically swung, the cylindrical member 4A at the tip thereof is connected to the vertically swinging arm 4 at a single point on the outer peripheral surface of the cylindrical member 4A. The cylindrical member 4A and the protruding piece 5A on the external fitting member are fixed together. In the locked state, as the vertical swing arm 4 swings, the crank arm 15A.

15A rotates in opposite directions due to the above-mentioned swing angle, and the relative positions of the left and right wheels 1, 1 change.
In the present invention, the protruding piece 5A is provided on an external fitting member that is rotatable relative to the cylindrical member 4A, and the protruding piece 5A is intended to change as the vertically swinging arm 4 swings up and down. The cylindrical member 4A and the protruding piece 5A are relatively rotated by the parallel rotation link mechanism 6 by an angle corresponding to the angle, and as a result, the left and right wheels 1, 1 can be rotated relative to each other while the relative positions of the left and right wheels 1, 1 are prevented from changing. This makes it possible to adjust the height positions of the left and right wheels 1°1 simultaneously and in the same direction by swinging the vertical swinging arm 4.

Note that the support frame 7A horizontally projects outward from the body frame T beyond the left and right wheels 1, 1.

At the roadside portion of 7A, spare seedling platforms 17, 17, which can hold and store seedling boxes, are placed between the intended preliminary seedling placement position and the storage position tilted inward on the axis along the direction of movement of the machine. It is attached around the core so that the position can be changed and fixed freely.

[Brief explanation of the drawing]

The drawings show an embodiment of the mobile agricultural machine with a wheel height changing device according to the present invention, in which Fig. 1 is an overall side view of the rice transplanter, Fig. 2 is an overall plan view, and Fig. 3 is an enlarged side view of the main parts. FIG. 4 is an enlarged partially cutaway plan view of the main part, and FIG. 5 is a longitudinal sectional front view. 1.1...wheels, 2,2...support frame,
4...Arm, 5...Lock mechanism, 5
A... Protruding piece, 6... Parallel rotation link mechanism, 6A, 6B... Protruding piece, 6C... Interlocking member, 7... ... Aircraft frame, 14...
・Horizontal axis, 15...Seesaw part, 15A...
... Crank arm, 16... Connection member.

Claims (1)

[Scope of utility model registration request] Crank arms 15A, 15 are attached to the free ends of the arms 4, which are driven to swing around the transverse shafts 14 on the side of the fuselage frame T, with their rotational axes oriented substantially horizontally and in opposite directions.
A scene member 15 with a protruding portion A is pivotally connected so as to be relatively rotatable, and the tips of the crank arms 15A, 15A are attached to left and right running wheels 1, 1, which are provided so as to be movable up and down with respect to the aircraft body. The seesaw member 15 has two projecting pieces 5A that are connected to each support frame 2, 2 via a connecting member 16.16, and that have different phases around the rotation axis of the seesaw member 15. , 6A is attached to the seesaw member 1.
5, and on the side of the fuselage frame 7 where the horizontal shaft 14 is provided, there is a protrusion 6B that protrudes in a direction along one of the protrusions 6A on the seesaw member 15 side. and an interlocking member 6C between one protrusion 6A on the seesaw member 15 side and the protrusion 6B on the fuselage frame T side.
to form a four-row link mechanism 6 in which the protruding piece 6B on the body frame I side serves as a fixed joint, and the other protruding piece 5A on the seesaw member 15 side is connected with the protruding piece 6B. A mobile agricultural machine with a wheel height changing device, characterized in that a locking mechanism 5 is provided which can fix and release the relative position of the crank arm 5A and the crank arm 15A.