JPH071928Y2 - Running wheel structure of agricultural work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a traveling wheel structure of an agricultural work machine, and more particularly to a traveling wheel structure of an agricultural work machine that is connected to a side of a tractor or the like to perform a predetermined work. .

[Prior Art] Generally, an agricultural work machine such as a mower conditioner is connected to a tractor or the like to transmit a driving force to perform a predetermined work and to travel on a field.

As shown in FIG. 3, a conventional agricultural working machine (mower conditioner) 1 of this type has a tow rod 2 and traveling wheels 3 for being towed by a tractor (not shown), and also travels. A disk 5 having a cutting blade 4 on the front side in the direction A
Is provided on the drive housing 6 side by side as appropriate. Then, the grass cut by the cutting unit 7 is crushed by the roller 8 provided at the rear of the cutting unit 7 and collected in rows on the field F via the chute 9.

Further, a chute 10 is provided on the lower surface of the drive housing 6, and the mowing section 7 is arranged along the unevenness of the field F by a predetermined distance to mow the grass. The traveling wheel 3 is an arm rotatably supported by the crusher 11.
Held by 12.

Then, when the direction is changed so as not to disturb the grass collection row or when the vehicle travels on the road, the traveling wheel 3 is moved in the substantially vertical direction by driving the hydraulic cylinder 13 provided between the arm 12 and the milling machine 11. The reaction force causes the reaper 7 to be separated from the ground. Further, during the normal work, the hydraulic cylinder 13 is contracted to the shortest state, and the length thereof keeps the distance between the traveling wheel 3 and the grinding wheel 11.

[Problems to be Solved by the Invention] In the above-described conventional mower conditioner 1, the shoe 10 is mounted up and down in order to adjust the cutting height h. That is, the adjustment is performed by changing the fastening position of the bolt (not shown) of the support fitting 14 provided to support the drive housing 6.

However, the shoe 10 and the traveling wheel 3 are used in a relatively soft grassland such as a new sowing grassland or a poor crushing land.
The ground contact pressure becomes relatively high, the shoe 10 is buried in the soil, and the traveling wheels 3 sink in the soil. For this reason, even if the height of the shoe 10 is changed, the mowing section 7 is stuck in the soil, and there is a problem that the mowing work cannot be performed.

In addition, the traveling wheels 3 are adapted to rotate in a direction orthogonal to the width direction of the machine body. For this reason, there is a problem that the turning radius cannot be reduced during the turning traveling, and it is difficult to use a large working machine in the narrow field F.

Therefore, in view of the above circumstances, the present invention was devised to provide a traveling wheel structure capable of appropriately maintaining the height of the mowing part and reducing the turning radius even in a soft field.

[Means for Solving the Problems] In the present invention, a wheel supporting member that supports a traveling wheel so as to be vertically movable relative to a machine frame is connected to a machine frame by a cylinder, and a piston rod of the cylinder is circumferentially and A collar that is slidable in the axial direction is fitted, a locking body that locks the collar is provided at the connecting part of the piston rod, and either one of the locking body and the collar surrounds a plurality of recesses with different depths. A locking member that is selectively loosely fitted in the recess is formed on the other side, and the contraction length of the cylinder is adjusted by bringing the collar locked by the loose fitting into contact with the cylinder portion of the cylinder. The expansion / contraction length adjusting device is configured.

Further, the wheel support member is provided with a vertical support shaft that supports the traveling wheel so as to be rotatable about its axis and offset from its axis, and that the vertical support shaft is provided between the vertical support shaft and the machine frame. It is preferably configured with parallel links that move along its axis.

[Operation] With the above configuration, the cylinder holds the machine frame at a predetermined height by contracting during normal work, and when the cylinder is turning or the like, extends to raise the machine frame so that the cylinder is provided. Release the work equipment to be grounded. When adjusting the height of the working equipment from the field during work, rotate the collar to loosely fit the locking member into the appropriately selected recess and lock the collar at the position corresponding to its depth. The cylinder is regulated to a desired contraction length by locking it on the body and bringing it into contact with the cylinder portion of the cylinder.

Further, in the configuration in which the wheel support member has the vertical support shaft and the parallel link, the cylinder moves the vertical support shaft downward while maintaining the displacement of the traveling wheels by the parallel link, and the reaction force thereof is reduced. To raise the machine frame.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a traveling wheel structure of an agricultural working machine according to the present invention, and shows a case where the traveling wheel structure is applied to a mower conditioner as an agricultural working machine. In the figure, the same components as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

This mower conditioner is a single-acting hydraulic cylinder 22 that is a cylinder between a wheel support member 21 that supports the traveling wheels 3 so as to be vertically movable with respect to the machine frame 11 and the machine frame 11 that has the reaper 7. This hydraulic cylinder 22 is provided and configured.
In addition, an expansion / contraction length adjusting device 23, which is a feature of the present invention, is provided. Further, in the present embodiment, the wheel support member 21 is formed to have the vertical support shaft 24 and the parallel link 25.

First, the configuration of the wheel support member 21 will be described.

The vertical support shaft 24 is provided substantially vertically behind the cutting unit 7 in the traveling direction A, and supports a caster bracket 26 at its lower end portion so as to be rotatable about its axis. Caster bracket 26
Is a trapezoidal shape when viewed from the side and is supported by the base end side.
The positions of 27 and the tip side 28 on the opposite side are inclined so as to shift in the traveling direction A. The traveling wheel 3 is rotatably supported by an axle 29 provided at the tip of the caster bracket 26. That is, the traveling wheel 3 is rotatable about the vertical support shaft 24, and the caster bracket 26 is rotatable from the axis B thereof.
Therefore, it is supported by being offset to the rear of the traveling direction A by the amount of inclination L.

The parallel ring 25 is formed by two link members 30 and 31 that are parallel to each other in the vertical direction and have the same length, and the lower portion of the gate frame 32 provided so as to straddle the machine frame 11 in the vertical direction and the vertical support. axis
Between the upper part of 24, both are maintained in parallel and connected. In other words, the vertical support shaft 24 is supported by the machine frame 11 so that it can be moved up and down along the direction of its axis B.

The hydraulic cylinder 22 is provided so as to extend substantially vertically between the parallel link 25 and an appropriately bent upper portion of the gate-shaped frame 32. In this hydraulic cylinder 22, the cylinder tube 33, which is the cylinder, is on the top,
A piston rod 34 is inserted in the lower part of the cylinder tube 33 so as to be able to move back and forth, and an upper end portion of the cylinder tube 33, which is a base end side, is rotatably supported by the gate frame 32.

On the other hand, the tip end of the piston rod 34 is rotatably connected to a position approximately in the middle of the upper link member 30, and the expansion / contraction length adjusting device 23 is provided at this connection portion.

As shown in FIG. 2, the expansion / contraction length adjusting device 23 includes a collar 35 slidably fitted in a piston rod 34 in a circumferential direction and an axial direction, and a locking body 36 engaging with the collar 35. Is formed by.

The collar 35 is formed to have a wall thickness that abuts the lower surface 37 of the cylinder tube 33, and a locking member 38 that projects radially outward is formed on the outer peripheral surface of the collar 35. The locking body 36 is supported on the bracket portion of the upper link member 30 at the lower end thereof by the connecting pin 39 together with the tip of the piston rod 34, and is formed substantially along the outer circumference of the piston rod 34. A plurality of recesses 40 that abut the locking member 38 are arranged in parallel on the upper part of the recesses 40 with different depths.

Therefore, the lowermost position of the cylinder tube 33 when the hydraulic cylinder 22 is contracted is moved upward by a height H of the collar 35 and a position height of the recess 40 with which the collar 35 engages with respect to a predetermined stroke. Will be done.

In addition, the hydraulic cylinder 22 is provided with a hydraulic pipe 41 connected to a hydraulic take-out device (not shown) of the tractor.

Next, the operation of this embodiment will be described.

When performing the mowing work on the field F, first, hydraulic pressure is supplied to the hydraulic cylinder 22 to extend the hydraulic cylinder 22. Then, the collar 35 is turned to select one of the recesses 40. For example, when working in the soft field F, the locking member 38 of the collar 35 is engaged with the shallowest recess 40.

Then, as shown in FIG. 1, by releasing the supply of the hydraulic pressure, the hydraulic cylinder 22 is contracted by the weight of the machine body.
At this time, the lower surface 37 of the cylinder tube 33 comes into contact with the upper end of the collar 35, so that the lowering is hindered. That is, machine frame
11 is held at a position higher than when working in a normal field F, and is placed in a working posture. With this, the reaper 7
The desired cutting height h is adjusted.

Further, when the vehicle is turning due to a direction change during work, the traveling wheel 3 is offset by L and is supported by the machine frame 11. Immediately correct the direction to make a smooth turn.

Further, when traveling on the field F in a non-working posture or overcoming a row of grass, the hydraulic pressure is supplied to the hydraulic cylinder 22. The hydraulic cylinder 22 is expanded by this hydraulic pressure,
Push down so that the parallel link 25 swings downward. The parallel link 25 makes the vertical support shaft 24 substantially vertical, that is, the traveling wheels 22.
Is moved downward while being held so as to be deviated by L behind the traveling direction A. With this, the working machine main body Z is relatively raised, and the cutting unit 7 is held apart from the field F surface.

As described above, the expansion / contraction length adjusting device 23 is provided on the hydraulic cylinder 22 so that the length of the hydraulic cylinder 22 when contracted is substantially changed. Therefore, even in the soft field F, the height of the mowing part 7 is reduced. Can be set to a predetermined cutting height h. That is, the grounding and height adjustment of the mowing part 7 by the shoe 10 are eliminated, and the height of the mowing part 7 is adjusted by the hydraulic cylinder 22.

Further, a locking body 36 and a collar 35 are provided as the expansion / contraction length adjusting device 23, and a locking member is provided in the recess 40 selected by the rotating operation of the collar 35.
Since the sleeve 38 is loosely fitted and the collar 35 in the loosely fitted state is brought into contact with the cylinder tube 33, the contraction length of the hydraulic cylinder 22 can be adjusted by a simple operation and the collar 35 can be adjusted.
The loose fitting state is maintained by the weight of 35, and the selected height can be reliably maintained. In other words, a device for fixing the locked state of the collar 35 and the locking body 36 is not required. Although the recess 40 is formed in the locking body 36 and the engaging member 38 is formed in the collar 35 in this embodiment, conversely, even if the engaging member is formed in the locking body and the recess is formed in the collar, It has the same effect.

Further, since it has a simple structure, it can be easily applied to a conventional mower conditioner and is extremely versatile.

The vertical support shaft 24 and the parallel link 25 cause the traveling wheels 3 to deviate from the direction in which the weight of the working machine main body Z is applied, and vertically move so that the positional relationship does not change. In addition to being able to perform smoothly, the mowing part 7 can be separated from the field F surface, and the row of grass is not disturbed.

Further, since the hydraulic cylinder 22 is connected in the middle of the upper link member 30, a large stroke amount can be obtained with a small stroke length. Further, the vertical movement distance can be adjusted by changing the connection position, that is, the power point position.

In the above embodiments, the vertical support shaft 24 and the parallel link 25 are shown as the wheel support member 21, but the expansion and contraction length adjusting device of the present invention has the wheel support member as shown in FIG. It can be applied even to various arms.

Furthermore, although the present invention has been shown as applied to a mower conditioner, it can also be applied to other similar agricultural working machines such as a corn harvester and a forage harvester.

[Effects of the Invention] In short, according to the present invention, the following excellent effects are exhibited.

A cylinder is provided by connecting the wheel supporting member and the machine frame with a cylinder, and providing an expansion / contraction length adjusting device for locking the collar and the locking body by a recess and a loose fitting of the locking member, and bringing the collar into contact with the cylinder. Since the contraction length is adjusted, the working equipment can be easily and surely held at an appropriate height even in a soft field, and the performance of the agricultural working machine can be improved.

Further, in the configuration in which the wheel support member has a vertical support shaft that rotatably deviates and supports the traveling wheel around the shaft, and a parallel link that moves the vertical support shaft along its axis, , The main body can be easily moved up and down as needed,
In addition, a smooth turning progress can be achieved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a traveling wheel structure of an agricultural working machine according to the present invention, FIG. 2 is an enlarged view of an essential part showing another posture thereof, and FIG. 3 is a conventional agricultural working machine. FIG. 3 is a side view showing the traveling wheel structure of FIG. In the figure, 21 is a wheel support member, 22 is a hydraulic cylinder that is a cylinder, 23 is a telescopic length adjusting device, 24 is a vertical support shaft, 25 is a parallel link, 33 is a cylinder tube that is a cylindrical portion, 34 is a piston rod, and 35 is a collar. 36 is a locking body, 38 is a locking member, and 40 is a recess.

Claims (2)

[Scope of utility model registration request] 1. A wheel supporting member for supporting a traveling wheel so as to be vertically movable with respect to a machine frame and the machine frame are connected by a cylinder, and are slidable in a circumferential direction and an axial direction on a piston rod of the cylinder. The collar is fitted, and a locking body for locking the collar is provided at the connecting portion of the piston rod,
A plurality of recesses having different depths are provided around one of the locking body and the collar, and a locking member that selectively loosely fits in the recess is formed in the other, and locking is performed by the loose fitting. A traveling wheel structure for an agricultural work machine, comprising an expansion / contraction length adjusting device for adjusting the contraction length of the cylinder by bringing the formed collar into contact with the cylinder portion of the cylinder. 2. The wheel support member is provided between a vertical shaft supporting the traveling wheel so as to be rotatable about an axis and displaced from the shaft center, and between the vertical shaft and the machine frame. The traveling wheel structure for an agricultural working machine according to claim 1, further comprising a parallel link for moving the vertical support shaft along an axis thereof.