JPS6041076Y2 - Disk for disk mower - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an improvement of a disc for a disc mower used for cutting grass, etc.

(B) Prior art The conventional disc 8 for a disc mower has a circular or elliptical peripheral surface 9 of the same width in the form of a flat or slightly downwardly sloping skirt, with cutters attached at appropriate positions. was.

Also known is, for example, a disc 8 which can be seen in the reaping device disclosed in US Pat. No. 3,555,798, which is shown in front in FIG. 4 and in plan in FIG.

The peripheral surface 9 of the disc 8 of this reaping device has the same width over the entire circumference, and two opposite peripheral surfaces of the inclined waist width
A notch is provided at the location, and a cutter 6 is fixed near the notch.

In the grass cutting device, the disk peripheral surface 9 having the same width and extending substantially all the way around is intended to blow the cut grass upward.

(c) Problems to be solved by this invention In general, disc mowers have a disc rotation speed of 3000 r, p, m.
The machine rotates at high speed both forward and backward, and the resulting wind force in the centrifugal direction causes the grass to fall in the centrifugal direction, resulting in uncut areas.

In addition, as shown in FIGS. 4 and 5, a conventional disk 8 having a peripheral surface 9 of the same width and inclined over substantially the entire circumference is used, and the peripheral surface 9 is used to remove the cut pasture. Even if the intention is to blow the grass upward, the cut grass will move by the length of the peripheral surface 9 and then be released backwards and upwards.
The amount of momentum required to release the grass increases and the power loss increases, resulting in a problem in that the horsepower required for the disc mower increases unnecessarily.

2) Means for solving the problem This invention forms a protruding body in the center of the elliptical disc plate, and the width of the elliptical disc plate is wider toward the outer edges of the shorter diameter part, which is different from the outer edges of the longer diameter part of the elliptical disc plate. It is an object of the present invention to solve these problems at once by providing a disk for a disk mower, which is characterized by having an upwardly inclined helical body protruding from a part of the periphery of the ellipse.

(E) Operation When the elliptical disk plate is rotated in the direction f, an upward wind is generated by the spiral body, and the grass is guided to stand upright.

This grass is cut by a cutter and discharged rearward by the upper surface of the oval disc plate and the protrusion.

In this case, the action of releasing grass on the top surface of the elliptical disk is
Since it is made from the part without the spiral, the emission area is small,
Since the grass is only moved directly behind the elliptical disc plate, the grass release reaction force is minimal.

(f) Embodiments Next, this invention will be explained based on drawings showing embodiments.

Reference numeral 1 designates an elliptical disk plate, which has a tapered protrusion 2 shaped like a truncated cone in the center, and becomes wider from both outer edges of a longer diameter portion 5 toward both outer edges of different shorter diameter portions 3. A spiral body 4 which is inclined upward is provided to protrude from a part of the periphery of the ellipse.

The spiral body 4 is formed to have a curve that does not exceed the rotation locus of the long diameter portion 5 from the end of each long diameter portion 5 of the elliptical disk plate 1 toward the ends of the different short diameter portions 3, and to gradually become wider. ,
One each is provided up to the vicinity of one short diameter portion 3.

A cutter 6 is rotatably attached to both outer edges of the long diameter portion 5 of the elliptical disk plate 1.

Reference numeral 7 denotes a guide body provided on the lower surface of the elliptical disk plate 1.

The guide body is curved or bent at the long diameter portion 5 of the elliptical disk plate 1 so as to avoid the cutter attachment portion, and extends approximately parallel to the three sides of the short diameter portion, and prevents centrifugal winds occurring on the lower surface of the elliptical disk plate 1. prevent.

8 is a shaft hole. The main disc having the above configuration is the second disc.
Housing 9 with a phase shift of 90° as shown in the figure.
Place and attach.

Therefore, the grass is mowed smoothly and continuously.

10 is a transmission case, 11 is a sliding plate, 12 is a cover, 13
is a cone, and numbers 9 to 13 form a mowing device.

14 is the rear part of the agricultural tractor (not shown).

), which is composed of a base frame 16 with a cylindrical shaft 15 at the end, a rotation device 17, and an input shaft 18, and the transmission case 10 is rotatably attached to the cylindrical shaft 15. installed.

F□, F2 indicate the release direction of cut grass, f□t
F2 indicates the rotation direction of the elliptical disk plate 1, r□, F2
indicates the wind direction regulated by the guide body 7.

(g) Effects of the invention This invention features a protruding body in the center of the elliptical disk plate,
Since the elliptical disk plate has a spiral body that is wider from both outer edges of the longer diameter portion to both outer edges of the shorter diameter portion and slopes upward, centrifugal wind force, which has been a problem in the past, is provided. This has the effect of converting the current into an upward wind and making the grass stand upright, allowing the grass to be completely cut.

In addition, since a spiral body is provided on a part of the periphery of the disk, that is, there is a part without a spiral body, the cut grass is discharged from that part to the minimum distance, completely eliminating the reaction force caused by wasteful discharge. It has the effect of being economical, requiring only the minimum amount of power required.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional perspective view showing an embodiment of the present invention, Fig. 2 is a plan view of main parts showing the installed state of the present invention, Fig. 3 is a front view showing the installed state of the present invention, and Fig. 4 is a front view of the conventional example, and FIG. 5 is a plan view thereof. DESCRIPTION OF SYMBOLS 1...Elliptical disc plate, 2...Protruding body, 3...Short diameter portion, 4...Spiral body, 5...
...long diameter section, 6 ... cutter, 7 ...
...Guide body.

Claims (1)

[Scope of utility model registration request] A protruding body is formed in the center of the elliptical disc plate, and the above elliptical disc is
For a disc mower characterized by having a spiral body protruding from a part of the elliptical periphery, which is wider from the outer edges of the longer diameter part of the disk plate to the outer edges of the shorter diameter part, and is inclined upward. disk.