JP6824097B2 - Mowing device - Google Patents

Description

The present invention is a mowing device provided with a mowing blade housing and a mowing blade rotatably provided inside the mowing blade housing with the vertical axis of the mowing blade housing as the center of rotation to mow grass. Regarding.

As the above-mentioned mowing device, there is one provided inside the cutting blade housing and provided with a mulching baffle plate that surrounds the rotation range of the cutting blade in the vertical view of the cutting blade housing. This mowing device makes it possible for the mowed grass mowed by the mowing blade to be fragmented inside the mulching baffle plate by cutting with the mowing blade.

As a mowing device of this type, there is a conventional one described in, for example, Patent Document 1. In the one described in Patent Document 1, a cutting grass guide member located around the front side of the rotation range of the cutting blade and a rear baffle plate located around the rear side of the rotation range of the cutting blade are provided, and the cutting grass guide is provided. The mulching baffle plate is composed of members and a rear baffle plate.

JP-A-2009-195206 (Fig. 5)

In the above-mentioned mowing device, if a large amount of mowed grass stays inside the mulching baffle plate, it causes clogging. If the cut grass is clogged, poor cutting will occur.

The present invention provides a mowing device capable of preventing clogging of mowing grass in a mulching baffle plate while preventing clogging of mowing grass in the mulching baffle plate from adversely affecting mowing by a cutting blade.

The mowing device according to the present invention
Cutting blade housing and
A cutting blade that is rotatably provided inside the cutting blade housing with the vertical axis of the cutting blade housing as the center of rotation and cuts grass.
A mulching baffle plate provided inside the cutting blade housing and surrounding the rotation range of the cutting blade in the vertical view of the cutting blade housing is provided.
The cutting blade includes a cutting blade portion and a raising portion rising from the tip end portion of the cutting blade portion.
Of the mulching baffle plate, the lower end of the rear plate portion located on the rear side of the cutting blade housing with respect to the rotation center is located above the cutting blade portion .
A guide member provided in a portion of the rotation range located on the front side of the cutting blade housing with respect to the rotation center and guiding the cut grass downward.
The guide member is provided with an inclined guide surface located on the lower end side toward the lower end side in the rotation direction of the cutting blade .

According to this configuration, the ground clearance of the rear plate portion of the mulching baffle plate is higher than the ground clearance of the cutting blade portion of the cutting blade, so that the cutting grass located inside the mulching baffle plate is the rear plate portion and the ground. easily come out behind the blade rotation range cutting through the gap between, it is possible to prevent the staying large amount of cutting grass mulching buffer full plate.
Further, since the cut grass receives the flow guidance by the guide member and flows toward the lower end side of the mulching baffle plate, the cut grass reaches the gap between the rear plate portion and the ground and easily escapes behind the cutting blade rotation range.
The mowed grass that comes out behind the rotation range of the mowing blade falls on the site of mowing, so it does not become an obstacle to mowing by the mowing blade.

Accordingly, mowing grass exits the mulching buffer full plate with hard cutting grass clogging mulching baffle plate is not obstruct mowing, it can be efficiently and mowing.

In the present invention, it is preferable that the lower end of the rear plate portion is located above the draft portion.

According to this configuration, the ground clearance of the rear plate portion becomes higher and the gap between the rear plate portion and the ground becomes wider, so that the cutting grass can easily come out to the rear of the cutting blade rotation range.

In the present invention, it is preferable that the lower end of the front plate portion of the mulching baffle plate located on the front side of the cutting blade housing with respect to the rotation center is located below the cutting blade portion.

According to this configuration, the ground clearance of the front plate is lower than the ground clearance of the cutting blade, and the gap between the front plate and the ground is narrowed, so that the mowing grass comes out in front of the cutting blade rotation range and the cutting blade. It is possible to prevent it from becoming an obstacle to mowing.

It is a left side view which shows the whole of a riding type mower. It is a bottom view which shows the mowing device. It is a longitudinal side view which shows the mowing device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a left side view showing the entire riding type mower. The direction [F] shown in FIG. 1 is the front direction of the traveling vehicle body, the direction [B] is the rear direction of the traveling vehicle body, the direction on the front side of the paper is the left direction of the traveling vehicle body, and the direction on the back side of the paper is the right direction of the traveling vehicle body. Define.

[Overall configuration of riding mower]
As shown in FIG. 1, the passenger-type mower includes a traveling vehicle body in which a pair of left and right front wheels 1 are rotatably equipped and a pair of left and right rear wheels 2 are movably equipped. The pair of left and right front wheels 1 are composed of caster type wheels. The pair of left and right rear wheels 2 are driven by power transmitted separately from a pair of hydrostatic continuously variable transmissions (not shown). A driving unit 3 is provided at the front of the traveling vehicle body. The driver unit 3 is provided with a driver's seat 4 and a pair of left and right control levers 5. A driving unit 6 is provided at the rear of the traveling vehicle body. The driving unit 6 is provided with an engine 7 that outputs power to a continuously variable transmission or the like. A mowing device 8 is provided between the front and rear wheels of the traveling vehicle body. The mowing device 8 is supported by the vehicle body frame 10 via a link mechanism 9. The mowing device 8 is lifted and lowered by the link mechanism 9 being lifted and lowered, so that the gauge wheel 11 is lifted and lowered while the gauge wheel 11 is in contact with the ground and the gauge wheel 11 is lifted and not lifted from the ground.

In the passenger-type mower, the pair of continuously variable transmissions can be operated separately by swinging the pair of left and right control levers 5, and the drive speed and drive direction of the left and right rear wheels 2 are changed separately. The vehicle body can be steered. The grass and grass can be mowed by the mowing device 8 by moving the traveling vehicle body in the descending work state.

[Structure of mowing device 8]
As shown in FIGS. 1, 2 and 3, the mowing device 8 includes a mowing blade housing 12. The cutting blade housing 12 includes a top plate portion 13, a front wall portion 14 extending downward from the front edge portion of the top plate portion 13, and left and right side walls extending downward from the left and right edge portions of the top plate portion 13. The unit 15 is provided.

Inside the cutting blade housing 12, three cutting blades 16 arranged in the lateral width direction of the cutting blade housing 12 are provided. Each cutting blade 16 is supported by the top plate portion 13 via a rotary support shaft 17, and can rotate with the axis of the rotary support shaft 17 as the rotation center P. The rotary support shaft 17 is covered with a cover 18. The shaft core of the rotary support shaft 17 extends in the vertical direction of the cutting blade housing 12. A drive unit 19 is provided on the upper surface side of the top plate unit 13. The power from the engine 7 is input to the drive unit 19 via the rotation shaft 19a (see FIG. 1), and the rotation support shaft 17 is driven by the input power, so that the cutting blade 16 rotates in the rotation direction F (FIG. 2). See).

As shown in FIGS. 2 and 3, the three cutting blades 16 include a cutting blade portion 16a whose intermediate portion in the longitudinal direction is supported by the rotary support shaft 17. Both tips of the cutting edge portion 16a are provided with an edge 16b and a drafting portion 16c. The wind raising portion 16c rises from the tip end portion of the cutting blade portion 16a to the upper surface side of the cutting blade portion 16a. When the cutting blade 16 is driven, the wind raising portion 16c rotates together with the cutting blade portion 16a, and the wind raising portion 16c generates a transport wind.

As shown in FIGS. 2 and 3, three mulching baffle plates 20 are provided inside the cutting blade housing 12. The three mulching baffle plates 20 are provided so as to separately surround the rotation ranges of the three cutting blades 16 in the vertical view of the cutting blade housing 12. Each mulching baffle plate 20 extends downward from the top plate portion 13 and is supported by the top plate portion 13. At the intersection of one mulching baffle plate 20 and the other mulching baffle plate 20 in adjacent mulching baffle plates 20, the plate portion 20a in one mulching baffle plate 20 constitutes the plate portion in the other mulching baffle plate 20. doing.

As shown in FIG. 2, of the mulching baffle plate 20, the rear plate portion 20R located on the rear side of the cutting blade housing 12 with respect to the rotation center P of the cutting blade 16 has the cutting blade 16 at the lower end RT of the rear plate portion 20R. It is configured to be located above the windbreak portion 16c. When the mowing device 8 is lowered to the lowering work state, a wide gap is formed between the rear plate portion 20R and the ground.

As shown in FIG. 2, among the mulching baffle plates 20, the front plate portion 20F located on the front side of the cutting blade housing 12 with respect to the rotation center P of the cutting blade 16 has the cutting blade 16 at the lower end FT of the front plate portion 20F. It is configured to be located below the cutting blade portion 16a. When the mowing device 8 is lowered to the lowering work state, the gap formed between the front plate portion 20F and the ground is narrowed.

As shown in FIG. 2, the guide member 21 is provided in a portion of the rotation range of the cutting blade 16 located on the front side of the cutting blade housing 12 with respect to the rotation center P of the cutting blade 16. The guide member 21 is supported by the mulching baffle plate 20. The guide member 21 is provided with an inclined guide surface 21a located on the lower end side in the cutting blade rotation direction. The cut grass that flows so as to rotate inside the mulching baffle plate 20 due to the action of the transport wind generated by the wind raising portion 16c comes into contact with the inclined guide surface 21a of the guide member 21, and the inside of the mulching baffle plate 20 is moved downward. It is guided down by the inclined guide surface 21a so as to flow toward it.

In the mowing device 8, during the mowing work, the mowed grass mowed by the mowing blade 16 receives the transport wind from the drafting portion 16c and flows to rotate inside the mulching baffle plate 20 while flowing inside the mulching baffle plate 20. It stays in the mulch and is shredded by the cutting blade 16. The cutting grass that flows inside the mulching baffle plate 20 is prevented from coming out in front of the rotation range of the cutting blade 16 by the narrow gap between the front plate portion 20F and the ground, and the cutting grass is fragmented. Be forced. The cutting grass flowing inside the mulching baffle plate 20 is guided down by the guide member 21 and faces the gap between the rear plate portion 20R and the ground, and the rotation range of the cutting blade 16 is widened from the wide gap between the rear plate portion 20R and the ground. By coming out to the rear, the cutting grass can be fragmented while preventing a large amount of cutting grass from staying inside the mulching baffle plate 20.

[Separate Embodiment] (1) In the above-described embodiment, the lower end RT of the rear plate portion 20R of the mulching baffle plate 20 is configured to be located above the draft portion 16c of the cutting blade 16. However, it may be configured so as to be located above the cutting blade portion 16a of the cutting blade 16 and below the drafting portion 16c.

(2) In the above-described embodiment, an example is shown in which the lower end FT of the front plate portion 20F of the mulching baffle plate 20 is located below the cutting blade portion 16a of the cutting blade 16. It may be configured so as to be located below the drafting portion 16c of the cutting blade 16 and above the cutting blade portion 16a.

(3) In the above-described embodiment, an example in which the guide member 21 is provided is shown, but the guide member 21 may not be provided.

(4) In the above-described embodiment, an example in which three cutting blades 16 are provided is shown, but two or less cutting blades and four or more cutting blades may be provided.

The present invention can be used for a mowing device installed in front of the front wheels.

12 Cutting blade housing 16 Cutting blade 16a Cutting blade part 16c Blower part 20 Mulching baffle plate 20R Rear plate part 20F Front plate part 21 Guide member FT Lower end of front plate part RT Lower end of rear plate part

Claims (3)

Cutting blade housing and
A cutting blade that is rotatably provided inside the cutting blade housing with the vertical axis of the cutting blade housing as the center of rotation and cuts grass.
A mulching baffle plate provided inside the cutting blade housing and surrounding the rotation range of the cutting blade in the vertical view of the cutting blade housing is provided.
The cutting blade includes a cutting blade portion and a raising portion rising from the tip end portion of the cutting blade portion.
Of the mulching baffle plate, the lower end of the rear plate portion located on the rear side of the cutting blade housing with respect to the rotation center is located above the cutting blade portion .
A guide member provided in a portion of the rotation range located on the front side of the cutting blade housing with respect to the rotation center and guiding the cut grass downward.
The mowing device is provided with an inclined guide surface located on the lower end side of the guide member on the lower side in the rotation direction of the mowing blade . The mowing device according to claim 1, wherein the lower end of the rear plate portion is located above the wind raising portion. The mowing device according to claim 1 or 2, wherein the lower end of the front plate portion of the mulching baffle plate located on the front side of the cutting blade housing with respect to the rotation center is located below the cutting blade portion. ..

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