JPS6118655Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a cutting width indicator for a rotary mower device that is attached to the abdomen of an agricultural tractor.

Rotary mowers mounted on the abdomen are generally called mid-mount mowers, but compared to front-mount or rear-mount mowers, the end of the cutting blade is not visible from the side, so the cutting width is difficult to see. You can only understand it by looking at it. It is especially difficult to understand when the rotary mower is located under the foot, and in the past, the position was determined by guessing and the mowing operation was performed using a slightly narrower calculation.

In order to solve these problems, the present invention provides an indicator at the outermost position of the cutting blade.It is not only provided on the rotary cover, but also protrudes to the front of the cover, and is placed above the boundary between the harvested and uncut areas of the field. The cutting width indicator is configured to slide on the cutting width.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is an overall side view of a rotary mower device attached to the abdomen of an agricultural tractor.

The engine is placed in the engine compartment 2 inside the bonnet 1 of the agricultural tractor, and the front PTO shaft protrudes forward from the engine crankshaft.
Front PTO pulley 3 and electromagnetic clutch device 4
has been established.

A V-belt 6 is wound around a front PTO pulley 3 whose power is connected and disconnected by an electromagnetic clutch device 4, and the direction is changed by tension pulleys 5, 5 to reach an input pulley 7 of a rotary mower device. Since the rotary mower device can be used when not in use, it is necessary to lift it above the belly of the agricultural tractor when not in use so that the cutting blade of the rotary mower device does not touch the ground.
Lifting of the rotary mower device takes place with the lifting handle 9. The lift handle 9 is provided next to the steering handle, and is located at a position where the operator in the seat can operate it while the vehicle is moving. The rotation of the lifting handle 9 causes the lifting arm 10 to rotate upward via the link, thereby lifting the lifting link 11 of the rotary mower device.

It is cross links 12, 14 that suspend the entire rotary mower device on the belly of the tractor. The cross links 12 and 14 are attached using pins 13 that can be easily attached, making it easy to attach and detach the cross links 12 and 14. An elongated hole is provided when the pin 13 of the cross link 14 is attached to provide room for extension of the cross link so that the cross link is in a folded state.
17 is a front wheel of the agricultural tractor, and 18 is a rear wheel of the agricultural tractor.

FIG. 2 is a plan view of the rotary mower device, and FIG. 3 is a side view thereof.

At the rotary cover 8, three rotating cutting blades 3
The 4, 35, and 50 rotation parts are covered from above to ensure safety. A front roller 16 is provided at the front end of the rotary cover 8, and a rear roller 22 is provided at the rotation shaft 21 of the rear tail wheels 15L, 15R. The rotation shaft 21 is rotated by the tail wheel rotation handle 29, and at the rotated position, pins biased by springs are inserted into holes 33 provided in the guide plate 32, and the position of the tail wheel is adjusted. Fix it. Cutting width indicator 19 from the front upper surface to the lower surface of the rotary cover 8,
20 are fixedly installed. The upper mounting portions of the cutting width indicators 19 and 20 are aligned with the outer periphery passing positions of the rotary cutting blades 34 and 50. The lower part is attached to the bulge 20
a, 19a are expanded to approximately the same plane as the rotating cutting blade,
It forms the sled surface. When the rotary cutting blade is about to come into contact with the ground for some reason, first the cutting width indicator 1
The bulges 9 and 20 are configured to prevent damage due to contact with the ground.

The shape of the rotating cutting blade is shown in Figures 12, 13, and 14.
As shown in the figure.

FIG. 12 is a plan view of the rotary cutting blade, FIG. 13 is a side view, and FIG. 14 is a side view.

The rotary cutting blade 35 is composed of one blade, and blade parts 35a are provided on opposite sides of both ends, and the blade is gradually inclined upward from the blade part 35a, so that the grass after cutting is thrown up. are doing. The three rotary cutting blades 34, 35, and 50 all have the same shape. Let me explain the power transmission structure of the rotating cutting blade.

Another pulley 44 is provided in the middle of the cutting blade shaft 43 of the cutting blade 35 where the input pulley 7 is located.
The V belt 30 is wound around the V pulley 44, and the V belt 30 is wound around the V pulley 44.
The belt 30 is wound between a total of four V-pulleys: a V-pulley 27 of the rotating cutting blade 34, a V-pulley 28 of the rotating cutting blade 50, and a tension pulley 23.

Tension arm 3 of tension pulley 23
1 is shown in FIG. 6, FIG. 7, and FIG. 8, and the structure of the belt detachment prevention devices 24 and 25 of the tension pulley 23 is shown in FIGS.
As shown in the figure.

FIG. 6 is an overall side sectional view of the tension pulley and tension arm, FIG. 7 is a plan view of the tension arm 31, FIG. 8 is a side sectional view, and FIG.
The figure is a plan view of the belt detachment prevention tool 24, FIG. 10 is a side sectional view, and FIG. 11 is a rear view.

The tension arm is pivoted about its boss portion 31d, is rotatable, and is always biased by a spring 26 in the direction of tensioning the tension pulley. The engagement portion of the spring 26 is a protruding rod 31a, and the tip of the spring 26 is engaged with a spring engagement hole 31b at the tip.

The tension pulley 23 is supported by a bearing on the pulley shaft 31c, and a side sectional view of the tension pulley mounted is shown in FIG.

The tension pulley 23 is lined with a V-belt 30, and the lined V-belt is a normal V-belt.
Since it cannot fit into the pulley groove, it often pops out of the shallow tension pulley groove. To prevent this, belt detachment prevention tool 2
4 and 25 are provided before and after the tension pulley. Since the V-belt 30 is lined, the belt rotates showing the weak part,
If the belt comes into contact with a too strong belt detachment prevention device, the belt will crack or tear, so the belt detachment prevention device 24 is configured in a curved shape 24a with relief allowance at both ends, so that it can escape when the belt comes into contact with it. A floating part 24b is provided on the belt detachment prevention tool formed of spring steel to give it elasticity. Because of this floating portion 24b, when hanging the belt 30, the belt 30 can be easily hung by bending this portion.

Next, the support portions of the rotating cutting blade shafts 40, 43 that support the rotating cutting blades 34, 35, 50 will be explained.

FIG. 4 is a side cross-sectional view showing a support portion of the rotary cutting blade shaft 43 of the rotary cutting blade 35, and FIG. 5 is a side cross-sectional view showing a supporting portion of the rotary cutting blade shaft 40 of the rotary cutting blade 34.

The bearing case 55 of the bearing 36 is fixed to the rotary cover 8 of the rotary mower, and the two bearings 3
6 and 36 support the rotary cutting blade shaft 40. A V-pulley 27 is fixed to the upper end of the rotating cutting blade shaft 40, and a rotating cutting blade 34 is fixed to the lower part. Rotating cutting blade 3
4, first fix the bearing 36 in the bearing case 55.
A spacer 37 that prevents the bearing from falling off is screwed onto the rotary cutting blade shaft 40, and then the rotating cutting blade 34 is inserted,
A large diameter washer 38 is inserted into this, and the tightening nut 3 is tightened.
Tighten at 9.

The spacer 37 has a larger diameter than the bearing case 55, and serves as a wrapping prevention plate to prevent straw or grass from wrapping around the bearing 36 and damaging the bearing 36, and also has a small spacer on the outer periphery into which a tool such as a screwdriver can be inserted. The hole 37a is opened and is used as a tool insertion hole for tightening the screw of the spacer 37 since it has a large diameter and also serves as a wrap prevention plate, so a spanner engagement surface is not provided. This allows you to tighten with a screwdriver, etc. even if you cannot use a spanner.

Also, when turning the tightening nuts of the rotating cutting blades 34, 35 with a spanner, the rotating cutting blades 40, 43 can be prevented from becoming entangled by pushing a screwdriver into the small hole 37a.

43 is a rotary cutting blade shaft of the rotary cutting blade 35, 42 is a bearing of the shaft, and 41 is a bearing case.

As described above, the mowing width indicator that displays the outermost circumferential position of the outermost rotary cutting blade is projected from the front of the upper surface of the rotary cover that covers the rotary cutting blade of the present invention, so that the boundary with the uncut part of the field You can move forward by tracing the cutting width indicator on the top of the cutting width indicator, eliminating the need to proceed by visual measurement as in the past.
Since it is shaped like a letter, it can be used as a handle when attaching a rotary mower to the abdomen of an agricultural tractor, and since the indicator extends downward, the extending part can also be used as a sled. be.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the rotary mower device attached to the abdomen of an agricultural tractor, Fig. 2 is a plan view of the rotary mower device, Fig. 3 is a side view of the same, and Fig. 4 is the rotation of the rotary cutting blade 35. Cutting blade shaft 43
FIG. 5 is a side sectional view showing the support part of the rotary cutting blade 3.
4 is a side sectional view showing the support portion of the rotary cutting blade shaft 40 of No. 4;
Figure 6 is an overall side sectional view of the tension pulley and tension arm, Figure 7 is the tension arm 3
, FIG. 8 is a side sectional view, FIG. 9 is a plan view of the belt detachment prevention tool, FIG. 10 is a side sectional view, FIG. 11 is a rear view, and FIG. 12 is a side sectional view of the rotating cutting blade. A plan view, FIG. 13 is a side view, FIG. 14 is a side view, and FIG. 15 is a spacer 3.
FIG. 7 is a side cross-sectional view of No. 7. 8... Rotary cover, 19, 20... Cutting width indicator, 34, 35, 50... Rotating cutting blade.

Claims (1)

[Scope of utility model claims] A rotary mower device characterized in that a cutting width indicator for displaying the outermost peripheral position of the outermost rotating cutting blade projects from the front of the upper surface of a rotary cover that covers the rotating cutting blade.