JPS606181Y2 - Mower front gauge wheel support device - Google Patents

Description

[Detailed description of the invention] This invention relates to a front gauge wheel support device for a mower. In particular, the front gauge wheel, which is rotatable around the vertical axis, can be raised and lowered using parallel links, thereby increasing the cutting height during work. It was devised to keep the rotation constant and to prevent damage to the target to be harvested due to stable free rotation.

As is well known, for example, in a rotary mower installed on the abdomen of a tractor, the front gauge wheel is adjustable up and down in order to vary the cutting height, and in this case, as shown in FIG. Generally, a vertical shaft 62 is provided at the front end of 61, and a front gauge wheel 63 is mounted so as to be freely movable around this vertical shaft 62.

This configuration is structurally simple, but when the link 61 is raised or lowered by the operating section to change the cutting height, the center of the vertical shaft 62 at the front end also moves along with it, as shown by the imaginary line in FIG. As a result, the center of the vertical axis 62 is in an inclined position.

Therefore, when the center of the vertical axis 62 is adjusted to a tilted position, it is difficult for the gauge wheel 63 to maintain stable forward directivity, and the gauge wheel 63 tends to become unstable.

In such a state, when the gauge wheel 63 rotates freely around the tilted vertical shaft 62, even though it was initially at a constant height, due to the oblique rotation, the height changes as shown by the numbered line in Fig. 6, and therefore the cutting height This caused the mowing to be uneven and uneven, and there was also the problem that the mowing machine tended to wander easily, causing damage to the grass being mowed.

This invention was devised to solve the above problem, and its characteristics are that a link fixing fulcrum in the horizontal axis direction is provided on the mower frame, and the front main link is linked to this fulcrum. The main link is pivoted in the middle, and the rear end side of the main link is provided with an elevating/lowering operation part that allows the main link to be pivoted, while the front end of the main link is equipped with a front gauge wheel that is rotatable around a vertical axis. is connected and equipped with the front gauge shaft,
It is configured to move up and down in parallel using parallel links formed including the front main link.

This invention will be explained below with reference to an illustrated example.

What is shown in FIGS. 1 to 4 is an example of an agricultural tractor equipped with a rotary mower M on the belly of the body.

1 is the body of a tractor, and as is well known, it is an integrated frame with an engine at the front and a transmission case 2 connected to the rear. A drive type front wheel 5 is mounted via an axle holder 4.

-In the large diameter section, there are fenders 7 on the left and right sides of the seat 6 in the center.
The vehicle is equipped with rear wheels 8, and a lift arm 9 that is raised and lowered by a hydraulic system is pivotally supported in the center of these wheels.

Reference numeral 10 denotes a fixed bracket mounted symmetrically in the middle between the front and rear of the tractor, and is formed by combining three upper and lower plates.

The lower end of this bracket 10 is long in the front and back, and fixing pins 11 with their axes directed in the front and back are distributed on the left and right sides of the bracket 10, and a pantograph-type lifting link mechanism 12 is connected to the bottom end of the bracket 10.
It consists of:

This mechanism 12 extends and contracts up and down by a lifting wire 13 connected between it and the lift arm 9.

Four lower ends of the mechanism 12 are pivotally connected to the mower frame 14.

As is well known, the front end of the machine frame 14 is formed into an arrowhead shape, and a slightly elevated discharge guide path 15 is formed on both sides of the outer end, and the rear upper surface thereof is a lower horizontal surface.

As shown in FIG. 4, a transmission box 17 is fixed to the front center of this lowered horizontal plane via a stay 16, and this box 17 is connected to a T.
It is shaped like a letter.

The lower end of the vertical barrel 17a is located slightly above the plane of the machine frame 14, and thus the upper and lower ends of the barrel 17a are
A cutter main shaft 18 which is supported by a shaft at a certain point projects downward inside the machine frame 14 through a bearing case 19 fixed to the machine frame 14, and a cutter 21 with a protective cover 20 attached to the lower end thereof.
The splines can be freely joined together.

In this way, the other pair of cutters 21 on both sides are configured to be interlocked by the belt 23 via the tension pulley 22.
In this case, a sheet metal transmission pulley 24 is fixed around the cutter main shaft 18 using the space formed between the transmission box 17 and the machine frame 14, and a corresponding sheet metal transmission pulley is also attached to the paternal cutter shaft 25. 24 is fixedly installed.

This pulley 24 has a saucer-shaped base plate 24a at one end in the axial direction, and a V-shaped belt receiving groove 24b is integrally formed from the outer periphery of the base plate through an overlapping portion.

On the other hand, a driven pinion 26 for receiving rotational force is fixed to the upper end of the power ivy main shaft 18, and a driving pinion 27 for this is fixed to the end of a pinion shaft 28 supported on the forward barrel 17b. The power is transmitted vertically downward.

This power from the front is driven by the engine's crankshaft, from which it is transmitted downward through the front transmission case 29 and transmitted to the rear pinion shaft 28 through the telescoping universal joint 30. is input.

The mower M is driven in this way, and the device for adjusting the cutting height of the cutter 21 configured in this mower M is explained here. 31 is a pair of front gauge wheels on the left and right, and 32 is a rear gauge wheel in the center. A front stay 33 is erected on both sides of the front end of the machine frame 14, and a first link fixed fulcrum shaft 34 in the horizontal axis direction is provided at the upper end of the front stay 33, and a second link fixed fulcrum shaft 35 is provided halfway at the bottom thereof. .

The front gauge wheel 31 is of a caster type, and its vertical shaft 36 is rotatable within the receiver tube 37, and a connecting plate 38 at the back of the receiver tube 37 is provided with movable support shafts 39 and 39 at two upper and lower points. , this movable support shaft 39.39 and the fixed support shaft 3 of the front stay 33
4.35, a pair of upper and lower main links 40 and a sub-link 46 are pivotally supported to form two vertical rows of parallel link mechanisms 1.

The upper link of this parallel link mechanism 1 is constituted by the front end of a long front main link 40, and the rear end includes an operating lever 41 and a cooperation link 42 that vertically moves and transmits the rotation of the lever 41.
It can be raised and lowered freely, and can be locked at an appropriate height by means of a lever lock stand 43 having a wave-shaped lock groove.

In this way, the front gauge wheel 31 is adjusted up and down.
Since a pair of left and right front gauge wheels 31 are provided, the left and right wheels are interlocked by extending the first link fixed fulcrum shaft 34 over a long period of time.

- The large diameter gauge wheel 32 can be adjusted up and down through the rear main link 44 and the link shaft 45.

Therefore, according to this invention with the above configuration, the front gauge wheel is raised and lowered via a parallel link mechanism, so the center of the spindle of the gauge wheel always maintains the same vertical axis posture, and therefore the front gauge wheel is raised and lowered. Even after being adjusted, it always operates normally and stably, so it won't wobble and damage the grass, etc., and it rotates smoothly without resistance, so it can follow the tractor well, and it doesn't have to be unreasonable in terms of durability. It is suitable.

In addition, since the same vertical axis attitude is always maintained, when the gauge wheel is rotated around this axis, the height relationship is always constant, so even if the gauge wheel is rotated during work, the cutting height will not change at all. You can reap it easily.

[Brief explanation of the drawing]

Fig. 1 is a side view of a mid-mount type tractor with a mower showing an example of this invention, Fig. 2 is its plan view, Fig. 3 is its front view, Fig. 4 is an enlarged sectional view of the power transmission device, and Fig. 5 is an enlarged view of the main part, and FIG. 6 is an explanatory diagram of a conventional example. 1... Airframe, 14... Mower machine frame, 31
...Front gauge wheel, 33...Front stay,
34...First link fixed fulcrum (axis), 36...
...Vertical axis, 38...Connection body, 40...
...Front main link, 41...Operation lever (operation part), 46...Sublink, M...Mower, l...Parallel link.

Claims (1)

[Claims for Utility Model Registration] A main link 40 that can swing up and down is pivotally supported by a front stay 33 installed upright on the mower frame 14, and a caster that swings around a vertical axis is attached to the front end of the main link 40. In the front gauge wheel support device for a mower in which a set of gauge wheels 31 is supported, the front stay 33 has a sub link 4 parallel to the main link 40.
6 is pivotably supported to be vertically swingable, and the front ends of the main link 40 and the sub link 46 are pivotally supported by a connecting body 38 to constitute a parallel link mechanism l that is vertically movable. A front gauge wheel support device for a mower, characterized in that a caster set gauge wheel 31 that swings is supported.