JPH0646636A - Mulching mower - Google Patents

Abstract

PURPOSE:To provide a mulching mower so designed that lawn cut by bar blades is finely chopped in a cutting edge housing and the chopped lawn is allowed to fall and discharged onto the field after cutting lawn; in this case, the cutting ability of the edge part inside the radial direction of each of the bar blades is increased. CONSTITUTION:The inner surface of the ceiling wall 18A of a cutting edge housing 18 is fitted with a curved guide plate 27 to guide, toward the revolving center, lawn cut by the edge part 20a outside the radial direction of each bar blade 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mulching mower which cuts grass clippings cut by a bar blade into small pieces in a cutting blade housing and drops and releases them to the cut grass trace.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 6 and 7, a bowl-shaped member 30 for forming a mulching processing chamber is provided on an inner surface of a ceiling wall 18A of a cutting blade housing 18 so as to surround an outer peripheral locus of a bar blade 19. There is proposed a method in which the grass clippings cut by the bar blade 19 are swung in the bowl-shaped member 30 for forming the mulching processing chamber so as to be finely cut and dropped to the cut grass traces.

[0003]

Among the blade edges 20 formed on the front edge in the rotational direction, the cutting grass cut by the blade edge portion 20a on the radially outer side has fins 21a on the rear edge in the rotational direction.
Is conveyed to the center side of the blade 19 by the ascending swirling flow due to and is shredded at the blade edge portion 20b on the radially inner side of the blade center side. However, many cut grasses are used for forming a mulching process chamber. Since it swivels along the outer periphery of the bowl-shaped member 30, it is difficult for the grass to gather on the center side of the blade, and there is a problem that the shredding efficiency at the blade edge portion 20b on the center side is poor. An object of the present invention is to improve the shredding efficiency of a mulching mower with a simple and inexpensive structure.

[0004]

To achieve the above object, the present invention is characterized in that the cutting blade housing has an inner surface of a ceiling wall cut by a blade edge portion on the radially outer side of the bar blade. The point is that a curved guide plate is provided to guide the turf toward the center of rotation.

[0005]

As shown in FIG. 1, the cutting grass cut by the radially outer blade edge portion 20a of the blade edges 20 formed at the front edge in the rotational direction is lifted by the fin 21a at the rear edge in the rotational direction. After being lifted up by the swirling flow, it is guided toward the center of rotation by the curved guide plate 27,
The blade edge portion 20b on the radially inner side of the blade center side is shredded.

[0006]

As a result of the above construction, the shredding efficiency of the mulching mower can be improved with a simple and inexpensive structure in which a curved guide plate is provided.

[0007]

Embodiments of the present invention will be described below for a mid-mount type riding mower. As shown in FIG. 4, the engine 1, the main clutch case 2 and the traveling mission case 3 are integrally connected, and the front frame 4 protruding forward from the engine 1 is provided with the front wheels 5 and the traveling mission case 3 is provided with the rear wheels. A mid-mount type riding mower is constructed by mounting a mower M between a front wheel and a rear wheel 5, 6 of an agricultural tractor having a body monocoque structure in which wheels 6 are axially supported, respectively, via a parallel link mechanism 7 so as to be vertically movable. is there.

The mower M is pivotally connected to the body by a front link 7a and a rear link 7b in a parallel four-link form.
It is configured to be driven up and down with the vertical movement of a lift arm 8 provided at the rear of the traveling mission case 3. That is, at the fulcrum of the lower link 9 that is vertically moved by the lift arm 8, on the same axis as the lower link 9,
A contact link 10 having a contact locking piece 10a for contacting the upper surface of the lower link 9 is rotatably provided, and the contact link 10 and the intermediate portion of the rear link 6 are connected to a rod 11a, L-shaped. The mower M is connected through a link mechanism 11 including a link 11b and the like, and is associated with the vertical movement of the lift arm 8.
Is configured so that it can be driven up and down.

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

The front wheels 5 are connected to the engine 1 from the main clutch 2a to the gear reduction device 1 in the clutch housing 2.
4 and the front wheel drive transmission shaft 15 for driving. In this way, the clutch housing 2
By driving the transmission shaft 15 for driving the front wheels through the gear reduction device 14 provided therein, it is not necessary to provide the transmission shaft for driving the front wheels from the rear traveling transmission case 3, so that the lower surface of the clutch housing 12 is provided. , A recess 1 for allowing the bevel gear case 16 on the upper surface of the mower M to enter
7 can be formed, and the mower M can be greatly raised.

As shown in FIGS. 1 to 3, the mower M includes three bar blades 19 in a cutting blade housing 18.
Are respectively rotatably driven about the longitudinal axis X. The bar blade 19 has a blade edge 20 formed at the front edge in the rotational direction, and makes the blade edge portion 20a on the radially outer side and the blade edge portion 20b on the radially inner side different in height position. ,
The upper and lower blade edge portions 20a and 20b are configured to shred the cut grass. Further, a diagonally upward fin 21a that generates upward wind with the rotation of the blade 19 is provided at the rear portion of the blade edge portion 20a on the radially outer side, and the radially inner side is provided. At the rear part of the blade edge portion 20b, an oblique downward guide surface 21b is formed which generates downward wind as the blade rotates.

The cutting blade housing 18 is provided with a grass clippings discharge port 22 on one lateral side thereof, and at the front part of the ceiling wall 18A of the cutting blade housing 18, a cutting grass discharge path 23 is formed along the front wall. And a vacuum plate 25 along the outer peripheral locus of the three bar blades 19 on the inner surface of the rear portion of the ceiling wall 18A. A plate 26 having a closing plate 26a for closing the grass clippings outlet 22 with respect to the side discharge cutting blade housing 18 as described above.
Is provided in a state of vertically cutting the cut grass discharge path 23, and is cut by the blade edge portion 20a of the bar blade 19 on the radially outer side of the plate 26 while crossing the cut grass discharge path 23. A curved guide plate 27 that guides the cut grass toward the center of rotation is provided.

The cut grass thus cut by the blade edge portion 20a on the radially outer side 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 fins 21a. While being guided toward the center of rotation, after being further finely cut by the blade edge portion 20b on the radially inner side,
Due to the action of the obliquely downward guide surface 21b that generates downward wind, it is dropped and discharged onto the cut grass mark.

[Other Embodiment] As shown in FIG. 5, the bar blade 19 is provided on the inner surface of the ceiling wall 18A of the cutting blade housing 18.
The bowl-shaped member 30 for forming a mulching processing chamber surrounding the outer peripheral locus of is provided, and in the bowl-shaped member 30, the cutting grass cut by the blade edge portion 20a on the radially outer side of the bar blade 19, A curved guide plate 27 that guides toward the blade edge portion 20b on the radially inner side on the rotation center side may be provided. Further, the mulching mower is not limited to the riding type and may be a walking type. Further, the mulching mower is not limited to the type in which a plurality of blades are installed, and may be the type in which one blade is installed.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

Figure 1: Bottom view of mower

[Figure 2] Vertical side view of mower

FIG. 3 is a perspective view of a blade

[Fig. 4] 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 vertical side view of the same.

[Explanation of symbols]

 18 Cutting Blade Housing 18A Ceiling Wall 19 Bar Blade 20a Blade Edge Part 27 Guide Plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Kyotani 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Hideo Okura 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house

Claims (1)

[Claims] 1. A mulching mower that cuts grass clippings cut by a bar blade (19) finely in a cutting blade housing (18) and drops and discharges them to the cut grass trace, said cutting blade housing (18). On the inner surface of the ceiling wall (18A) of the blade blade portion (2) on the radially outer side of the bar blade (19).
A mulching mower provided with a curved guide plate (27) for guiding the grass clippings cut by 0a) toward the center of rotation.