JP2777021B2 - Mulching mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mulching mower in which cut grass cut by a bar blade is finely cut in a cutting blade housing, and is dropped and discharged onto the cut grass grass.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 6 and 7, a bowl-shaped member 30 for forming a mulching chamber for surrounding the outer trajectory of a bar blade 19 is provided on the inner surface of a ceiling wall 18A of a cutting blade housing 18. There has been proposed a method in which the cut grass cut by the bar blade 19 is turned finely in the bowl-shaped member 30 for forming the mulching chamber to be cut into small pieces and dropped onto the cut grass traces.

[0003]

Among the blade edges 20 formed at the front edge in the rotation direction, the cut grass cut by the blade edge portion 20a on the radially outer side is turned into the fin 21a at the rear edge in the rotation direction.
Is conveyed to the center side of the blade 19 by the upward swirling flow, and is shredded at the blade edge portion 20b on the radially inward side of the blade center side. Many cut grass are used for forming a mulching chamber. Since the blade is turned around the outer periphery of the bowl-shaped member 30, it is difficult for the lawn grass to gather at the center of the blade, and there is a problem that the cutting efficiency at the center edge 20b is poor. An object of the present invention is to increase the shredding efficiency of a mulching mower with a simple and inexpensive structure.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a mulching mower according to the present invention is characterized in that a front edge portion of a bar blade rotatably driven about a longitudinal axis is vertically different in height position. A mulching mower provided with a blade edge portion at a front edge portion of the bar blade, cutting the cut turf finely in a cutting blade housing and dropping and discharging the cut turf trace, The outer edge portion of the front edge portion is located at a lower position to form a blade edge portion, and a fin for upward wind generation is formed behind the blade edge portion, and the rotation of the bar blade is higher than that of the blade edge portion. A front edge of the portion close to the axis is provided at a higher position than a blade edge portion of the outer portion, and a guide surface that is lower rearward is formed behind the front edge, and a blade edge of a front edge of the outer portion of the bar blade is provided. The cut grass cut by the part is the rotation center side A curved guide plate that guides toward the center, from the vicinity of the front end portion in the advancing direction of the fuselage on the rotation locus of the bar blade, the guide positioned closer to the rotation center side than the radially outer blade edge portion. The cutting blade housing is provided on the inner surface of the ceiling wall over a range including the rotation trajectory of the surface.

[0005]

The cut grass cut by the blade edge portion formed at the leading edge of the bar blade in the rotation direction on the tip side is soared upward by the upward blast generated by the fins in the rotation direction rear side of the blade edge portion. After that, the front edge located closer to the rotation center side than the blade edge portion on the tip side of the bar blade from the vicinity of the front end portion in the advancing direction of the body on the rotation locus of the bar blade becomes higher and lower rearward. A curved guide plate provided on the inner surface of the ceiling wall of the cutting blade housing over a range including the rotation trajectory of the surface allows the blade to be moved inward in the radial direction. Then, the cut grass that is brought inward in the radial direction is further guided downward by the guide surface, so that the cut grass that is guided below is shredded by the blade edge of the outer portion of the bar blade. As a result, the shredding process is promoted. By the way, cutting of turf in the planted state is mainly performed in the rotation phase on the front side in the traveling direction in the rotation trajectory of the bar blade, and when the cut grass is further shredded, In order to improve the cutting performance, it is desirable that a large amount of cut grass is not mixed into the existing position of the planting grass to be cut. Therefore, in the present invention, a curved guide plate is provided as described above,
The rotation range of most of the lawn grass with respect to the blade is restricted so as to be mainly a rearward region of the rotation phase of the bar blade in the advancing direction of the fuselage. As a result, a large amount of cut grass is less likely to be mixed into the area of the grass to be cut, and cutting of the planted grass with the bar blade and shredding of the cut grass are easily performed easily.

[0006]

As a result of the above construction, the cutting of the planting turf by the mulching mower can be performed with a simple and inexpensive structure in which only the shape of the bar blade and the installation position of the curved guide plate are devised, and the cutting of the cut turf. Can also be performed with high processing efficiency.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a mid-mounted riding mower. As shown in FIG. 4, the engine 1, the main clutch case 2, and the traveling transmission case 3 are integrally connected, and the front wheels 5 are mounted on a front frame 4 projecting forward from the engine 1, and the rear wheels are mounted on the traveling transmission case 3. A mower M is mounted between the front and rear wheels 5 and 6 of the agricultural tractor having a monocoque structure of the vehicle body, each of which supports the wheel 6, and is vertically movable via a parallel link mechanism 7 to constitute a mid-mount type riding mower. is there.

The mower M is pivotally connected to the fuselage by a front link 7a and a rear link 7b in the form of a quadruple link.
It is configured to be driven up and down as the lift arm 8 provided at the rear of the traveling transmission case 3 moves up and down. That is, at the fulcrum of the lower link 9 moved up and down by the lift arm 8, coaxially with the lower link 9,
A contact link 10 having a contact locking piece 10a contacting the upper surface of the lower link 9 is rotatably provided, and the contact link 10 and a middle part of the rear link 6 are connected to a rod 11a, L-shaped. The mower M is connected via a link mechanism 11 including a link 11b and the like, and the lift arm 8 moves up and down.
Is configured to be able to be driven up and down.

The rear link 7b is pivotally connected to a fulcrum bracket (not shown) bolted to the side of the clutch housing 2 directly connected to the engine 1.
The L-shaped link 11b of the link mechanism 11 is pivotally connected to a pivot shaft 13 that penetrates a bottom wall portion of the traveling transmission case 3.

The front wheel 5 is connected to a gear reduction device 1 in a clutch housing 2 from a main clutch 2 a directly connected to the engine 1.
4 and a drive shaft 15 for driving the front wheels. Thus, the clutch housing 2
By driving the transmission shaft 15 for driving the front wheels through the gear reduction device 14 provided therein, there is no need to provide a transmission shaft for driving the front wheels from the rear traveling transmission case 3. , 1 for receiving the bevel gear case 16 on the upper surface of the mower M
7 can be formed, and the mower M can be greatly increased.

As shown in FIGS. 1 to 3, the mower M includes three bar blades 19 in a cutting blade housing 18.
Are disposed so as to be rotatable around the vertical axis X. The bar blade 19 has a blade edge 20 formed at the front edge in the rotation direction, and the height position of the radially outer blade edge portion 20a and the radially inner side blade edge portion 20b are made different. ,
The upper and lower two blade edge portions 20a and 20b are configured to shred the cut grass. At the rear of the radially outer blade edge portion 20a, there is provided an obliquely upward fin 21a for generating an upward wind with the rotation of the blade 19, and An obliquely downward guide surface 21b that generates a downward wind with the rotation of the blade is formed at the rear portion of the blade edge portion 20b on the inner side in the direction.

The cutting blade housing 18 has a cut grass discharge port 22 on one lateral side, and a cutting grass discharge path 23 along the front wall at the front of the ceiling wall 18A of the cutting blade housing 18. And a vacuum plate 25 along the outer trajectory of the three bar blades 19 on the rear inner surface of the ceiling wall 18A. The plate 26 having the closing plate 26a for closing the cut grass discharge port 22 with respect to the cutting blade housing 18 for side discharge.
The bar blade 19 is cut by the blade edge portion 20a on the plate 26 in a state of traversing the cut grass discharge path 23 and radially outward of the bar blade 19. A curved guide plate 27 for guiding the cut grass toward the center of rotation is provided.
That is, as shown in FIG. 1, the cut grass is rotated by the rotation center of the bar blade 19 so that the bar blade 19 can be shredded in the rotation phase from the front side to the rear side in the traveling direction of the riding mower. The guide plate 27 is configured to guide toward the side.
More specifically, the guide plate 27 is attached to the bar blade 19.
The guide plate 27 is cut over a range including the rotation locus of the guide surface 21b located closer to the rotation center side than the blade edge portion 20a on the radially outward side from the vicinity of the front end portion in the advancing direction of the body in the rotation locus of FIG. The blade housing 18 is provided on an inner surface of a ceiling wall 18A.

Thus, the cut grass cut by the radially outer blade edge portion 20a of the bar blade 19 is guided by the vacuum plate 25 and the guide plate 27 by the upward swirling flow of the rear fin 21a. After being guided toward the rotation center side while receiving the restricting action and being further finely cut by the blade edge portion 20b on the radially inner side, it is subjected to the action of the obliquely downward guide surface 21b that generates a downward wind. As a result, the cut grass that has been guided downward by the guide surface 21b is cut finely by the blade edge portion 20a on the radially outward side, and is dropped and released.

Another Embodiment As shown in FIG. 5, a ceiling wall 18A of the cutting blade housing 18 is provided.
Is provided with a bowl-shaped member 30 for forming a mulching chamber surrounding the outer trajectory of the bar blade 19, and inside the bowl-shaped member 30, a radially outer blade edge portion 20 a of the bar blade 19 is provided. A curved guide plate 27 may be provided to guide the cut turf cut in the direction toward the blade edge portion 20b on the radially inner side on the rotation center side. The mulching mower is not limited to the riding type but may be a walking type. Further, the mulching mower is not limited to the type having a plurality of blades but may be the type having a single blade.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a bottom view of the mower.

FIG. 2 is a longitudinal side view of the mower.

FIG. 3 is a perspective view of a blade.

FIG. 4 is an overall side view.

FIG. 5 is a bottom view of another embodiment.

FIG. 6 is a bottom view showing a conventional structure.

FIG. 7 is a longitudinal sectional side view of the same.

[Explanation of symbols]

 18 Cutting blade housing 18A Ceiling wall 19 Bar blade 20a Blade edge 21a Fin 21b Guide surface 27 Guide plate

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Minoru Kyoya 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Hideo Okura 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (56) References JP-A-4-131007 (JP, A) JP-A-4-52415 (JP, U) JP-A-4-55225 (JP, U) Jiko 60-14341 (58) Investigated Field (Int.Cl. ⁶ , DB name) A01D 34/00-34/86

Claims (1)

(57) [Claims] 1. A bar brake which is driven to rotate about a vertical axis.
The front edge of the door (19) is set up and down at different heights.
At the front edge of the bar blade (19).
A blade edge portion (20a) is provided, and the cut grass is cut into a cutting blade housing.
(18), cut it into small pieces, drop it onto the cut grass and release it
A mulching mower, wherein the outer portion of the leading edge of the bar blade (19) is low.
Edge portion (20a) is formed at the position
Behind the minute (20a), the fins (21)
a), the bar being higher than the edge portion (20a).
The front edge of the portion of the blade (19) near the rotation axis is
And higher than the blade edge portion (20a).
A guide surface (21b) that is lower at the rear side is formed behind
And, a curved type of guide plate for guiding (27) toward the rotation center side of the grass clippings cut by the blade edge portion of the leading edge (20a) of the outer part of the bar blades (19), said bar blade (19 ), From the vicinity of the front end portion in the advancing direction of the aircraft in the rotation locus, the blade edge portion (2
0a), the guide surface (21 ) located on the rotation center side.
A mulching mower provided on the inner surface of the ceiling wall (18A) of the cutting blade housing (18) over a range including the rotation locus of b) .