JPH06104013B2 - Lawn mower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a walking type and riding type lawnmower.

[Conventional technology]

Lawn mowers generally house a cutter blade that cuts lawn in a cutter housing below the fuselage, and this cutter blade has a wing that causes wind to convey and discharge the cut lawn and is installed in the fuselage. Turf mowed by the cutter blade rotated by the engine is discharged from the discharge port provided in the cutter housing by the wind generated by the blades.

In addition, the grass lawn discharged from the discharge port of the cutter housing is stored in a glass bag installed in the rear of the machine via a shooter.In this case, a blower is installed in the rear of the machine in order to increase the lawn transfer capacity. Those provided with are in practical use (see, for example, USP4104852).

[Problems to be solved by the invention]

As described above, the grass turf is discharged from the discharge port of the cutter housing by the wind generated by the blades provided on the cutter blade, and the grass bag stores the turf discharged from the discharge port of the cutter housing by the blower. Send it to a glass bag via shooter.

When the lawn mower becomes large, it is necessary to increase the discharge capacity of the lawn, but if the blades of the cutter blade are made large, there is a problem that noise is increased, so the blades cannot be made too large.

Also, in the case where a glass bag and a blower are installed in the rear of the machine, when the driving force is taken from the rotary axis of the cutter blade, the belt transmission does not fit within one plane, the drive system becomes complicated, and a separate auxiliary engine is required. There is a problem in that a device provided to drive the blower becomes expensive.

The present invention has been made in view of the above points,
An object of the present invention is to provide a lawnmower capable of increasing the discharge and transport capacity of grass clippings, reducing noise, simplifying the drive system, and improving the finish of grass by improving the rising performance of grass during lawn mowing. And

[Means for solving problems]

The structure of the present invention for achieving the above object is a lawn mower in which a cutter housing accommodating a plurality of cutter blades having a rotating shaft arranged in a vertical direction is provided below the machine body, and a discharge port is provided in the cutter housing. At
A blower having a rotary shaft arranged in the longitudinal direction is attached to the cutter housing, and the blower has a suction port opening on the lower surface of the blower facing the cutter housing and a blower discharge port close to a discharge port of the cutter housing. It faces the outside of the cutter housing.

[Action]

An airflow sucked up by the blower is generated in the cutter housing, and the airflow causes the grass in the cutter housing to stand up, and the grass is easily cut by the cutter blade. Then, the cut grass is sucked up from the suction port of the blower and discharged from the discharge port of the blower. The cut grass is also discharged from the discharge port provided in the cutter housing by the air flow generated by the cutter blade. In this case, since it is discharged at a position close to the discharge port of the blower, it is discharged satisfactorily along with the air flow from the blower.

〔Example〕

FIG. 1 is a plan view of a riding lawn mower to which the present invention is applied, FIG. 2 is a plan view of relevant parts, FIG. 3 is a sectional view of the same, and FIG. 4 is a perspective view of a discharge port portion.

The riding lawn mower 1 is provided with front wheels 2 and rear wheels 3 on the left and right of the front and rear parts of the machine body, and the rear wheels 3 are driven and moved by an engine mounted on the front part of the machine body.

Reference numeral 4 denotes a seat provided at the rear of the machine body, and 5 denotes a steering handle provided at the front thereof.

Then, the cutter blade 7 in the cutter housing 6 disposed below the substantially central portion of the machine body is rotationally driven in the horizontal plane by the engine to cut grass.

A pair of cutter blades 7 are provided in the left-right direction of the machine body,
The rotation loci are arranged so as to partially overlap each other when viewed from the front-rear direction. That is, the right cutter blade 7 is arranged near the rear wheel 3, the left cutter blade 7 is arranged near the front wheel 2,
In addition, the center distance between both cutter blades 7 is arranged at a distance slightly shorter than the length of the cutter blades 7. The cutter housing 6 that covers these is a peripheral wall 6b that hangs from the outer periphery of an upper wall 6a that covers the upper portion of the cutter blade 7.
Connect the left and right circular arc portions (a part of the right circular arc portion has a slightly different shape, which will be described later) and the left and right circular arc portions arranged along the rotation loci of the left and right cutter blades 7, and connect these end portions to each other. It consists of front and rear straight sections that extend diagonally rearward from the left side to the right side. As described above, the cutter housing 6 has a cover-like shape with an open lower part, but a part thereof is notched because the blower housing 9 to be described later is arranged.

The housing 9 of the blower 8 is a main body that houses the impeller 10.
11 and a duct portion 12 extending therefrom, and are arranged so as to overlap the cutter housing 6 in the notches of the upper wall 6a and the peripheral wall 6b of the cutter housing 6. The main body 11 includes a substantially circular horizontal upper wall 11a, a bottom wall 11b, and a peripheral wall 11c.
It is a substantially circular case composed of and arranged on the cutter blade 7 on the left side of the cutter housing 6. The peripheral wall 11c is in contact with the inner wall surface of the notch in the left central portion of the upper wall 6a of the cutter housing 6, the upper wall 11a being disposed above the upper wall 6a of the cutter housing 6, and the bottom wall 11b. Is the cutter blade 6 below the upper wall 6a of the cutter housing 6.
It is arranged below the upper wall 6a and above the cutter blade 7, and a suction port 13 opens at the center thereof to face the inside of the cutter housing 6, and the center thereof coincides with the center of the cutter blade 7. Then, the front right side of the airframe of the peripheral wall 11c is opened, and the duct portion 12 having a rectangular cross section is connected to this, and the side wall 12 thereof is formed.
c and 12d linearly extend to the right side of the machine while being in contact with the inner wall surface of the cutout portion of the upper wall 6a of the cutter housing 6, and the bottom wall 12b is in contact with the upper surface of the cutout portion of the peripheral wall 6b of the cutter housing 6, and the duct portion 12 projects from the outer peripheral surface of the cutter housing 6 on the right side of the cutter blade 7 and has a tip opening to form a discharge port 14.

Then, the impeller 10 is arranged in the main body portion 11, and the impeller 10
The vertical rotating shaft 15 of is rotatably supported. This impeller 10
The rotary shaft 15 of the is coaxial with the rotary shaft of the cutter blade 7. That is, the rotary shaft 15 extends through the suction port 13 provided at the center of the bottom wall 11b of the main body 11 and the cutter blade 7 is fixed to the lower end thereof. Impeller 10 has a vertical axis of rotation
It is composed of a conical bottom plate 10a that inclines downward toward 15, and a plurality of vanes 10b that are provided on the lower surface of the bottom plate 10a and that extend from the rotating shaft 15 while curving radially.

An air guide plate 16 is provided on the left side of the cutter blade 7 in the cutter housing 6, and the air guide plate 16 is in contact with the upper wall 6a from the inner surface of the rear peripheral wall 6b at a substantially central position in the left-right direction of the cutter housing 6. Main part of blower housing 9
The wind generated by a wing 17 provided at the tip of the cutter blade 7 and extending upward while being curved to the outer surface of the peripheral wall 11c of 11 is guided to the suction port 13 of the blower housing 9.

Further, the cutter housing 6 portion accommodating the cutter blade 7 on the right side is provided with a discharge port portion 18 from which the tip of the duct portion 12 of the blower 8 is adjacent and protrudes from the arc portion,
The tip of the discharge port portion 18 is opened to form a discharge port 19. The upper wall 6a of the blower 8 adjacent to the duct portion 12 is tilted upward toward the right end, and is flattened at the discharge port portion 18 so that the upper wall 12a of the duct portion 12 is flush. That is, the blower 8 is provided on the right side of the cutter housing 6.
A discharge path is formed in which the duct portions (12) of (1) run adjacent to each other and run in parallel. The side wall of the blower 8 at the tip of the duct 12 facing the cutter housing discharge port 18 is cut away so that the tip of the duct 12 and the cutter housing discharge port 18 communicate with each other.

Next, a drive system for the cutter blade 7 and the blower 8 will be described.

Common vertical rotation axis for cutter blade 7 and blower 8
15 and the vertical axis of rotation of the other cutter blade 7 20
Respectively protrude from the upper walls 11a and 6a, and the pulleys 21 and 22 are fixed to the protruding shafts thereof, and the pulleys 21 and 22 and the drive pulley provided above the cutter housing 6
A belt 25 is stretched between the 23 and the tension pulley 24. Further, another pulley 26 is provided on the shaft of the drive pulley 23, and the pulley 26, a pulley 27 provided on the output shaft side of the engine, and a pair of pulleys 28 and 29 provided below the pulley 27 are provided. A belt 30 is stretched between them, the power of the engine is transmitted to the pulley 26 by the belt, and
By 25, the two cutter blades 7 and the impeller 10 of the blower 8 rotate in the arrow direction.

Therefore, the grass is mowed by the two cutter blades 7 that rotate in the direction of the arrow. Then, an air flow is generated in the cutter housing 6 by the blades 17 at the tip of the cutter blade 7, and the air flow by the left cutter blade 7 is guided by the baffle plate 16 and guided to the suction port 13 of the blower 8, and The airflow directly sucked up by the blower 8 is generated, and the grass cut by these airflows is sucked up from the suction port 13 of the blower 8 and discharged from the discharge port 14 through the duct portion 12. Further, the cut grass is discharged from the discharge port 19 of the cutter housing 6 by the air flow from the cutter blade 7 on the right side. At this time, since it is discharged at a position close to the discharge port 14 of the duct portion 12,
It is satisfactorily discharged along with the air flow from the duct section 12.

Although FIG. 1 shows that the grass is released to the outside air without storing it, the grass may be stored in the glass bag 31 provided at the rear of the machine as shown in FIG. Of course you can. That is, a glass bag 31 for storing lawn grass at the rear of the aircraft
The glass bag 31 and the duct part of the blower 8
The shooter 32 connects between the discharge ports 14 of 12 and the discharge port 19 of the cutter housing 6. In this way, both outlets 14,1
The grass clippings released from 9 pass through the shooter 32 and are stored in the glass bag 31.

Further, the plane position and the height position of the blower 8 on the cutter housing 6 are not limited to those in the above-mentioned embodiment, and the suction port 13 opening to the lower surface of the blower 8 faces the inside of the cutter housing 6 and the blower 8 The blower 8 may be provided in the cutter housing 6 such that the discharge port 14 of the blower 8 approaches the discharge port 19 of the cutter housing 6 and faces the outside of the cutter housing 6.

In addition, although the number of the cutter blades 7 is two in FIG. 2, the present invention can also be applied to three or more. Further, the shape of the cutter housing 6 that covers these cutter blades 7 is not limited to that shown in FIGS.

Further, in the above-mentioned embodiment, an example in which the present invention is applied to a riding lawn mower has been described, but the present invention can of course be applied to a walking lawn mower.

Further, the blades 17 of the cutter blade 7 may not be provided on the cutter blade 7 directly below the blower 8.

Further, it is preferable to provide an air guide plate 16 for guiding the wind generated by the cutter blade 7 to the suction port 13 of the blower 8. In that case, the position of the cutter blade 7 and the blower 8 are provided.
The position, the shape, etc. may be appropriately selected and provided so that the wind is well guided to the suction port 13 of the blower 8 depending on the position and the like.

〔The invention's effect〕

Since the rotary shaft of the cutter blade and the rotary shaft of the blower are both arranged in the vertical direction, belt transmission can be performed in a plane between them and a drive system for obtaining the driving force of the blower can be easily performed.

In addition, since the blower is mainly responsible for the discharging and conveying function of the cut grass, the blowing action of the cutter blade can be reduced. As a result, the blades provided on the cutter blade can be made smaller and can be eliminated, so that noise can be reduced. Then, the cut grass is also discharged from the discharge port of the cutter housing by the air flow generated by the cutter blade, but in this case, it is discharged favorably along with the air flow from the discharge port of the adjacent blower.

Further, since the air in the cutter housing is directly sucked up by the blower through the suction port 13, the grass in the cutter housing rises well due to the air flow, the grass can be properly cut, and the finish of the grass is improved. In this case, the grass on the footsteps of the wheels is also strongly sucked up and the grass stands up, so that the finishability is improved.

Further, since the blower can be provided on the side of the cutter housing without largely projecting, the width of the lawn mower is not increased, and therefore a narrow place can be mowed, and the lawn mower can be stored easily. Edge cutting can be done without any trouble.

Further, since the blower sucks up the air in the cutter housing directly, dust is prevented from being discharged to the outside of the cutter housing.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIGS. 1 and 5 are plan views of a riding lawn mower to which the present invention is applied, FIG. 2 is a plan view of relevant parts, FIG. FIG. 4 is a perspective view of the discharge port portion. 1 is a riding lawn mower, 6 is a cutter housing, 7 is a cutter blade, 8 is a blower, 9 is a blower housing,
10 is an impeller, 11 is a main body part, 12 is a duct part, 13 is a suction port,
14, 19 are outlets, 15, 20 are rotating shafts, 16 are baffle plates, 17 are wings, 18 are outlets, 21, 22, 23, 24, 26, 27, 28, 29 are pulleys, 25, 30 is a belt, 31 is a glass bag, and 32 is a shooter.

Claims (4)

[Claims] 1. A lawn mower having a cutter housing accommodating a plurality of cutter blades having a rotary shaft arranged in a vertical direction at a lower part of a machine body, wherein the cutter housing is provided with a discharge port. The blower to be arranged is attached to the cutter housing, and the blower has a suction port that opens on the lower surface of the blower facing the inside of the cutter housing and a discharge port of the blower that faces the discharge port of the cutter housing and faces the outside of the cutter housing. A lawn mower characterized by being out. 2. The lawnmower according to claim 1, wherein the discharge port of the cutter housing and the discharge port of the blower face the outside air outside the cutter housing. 3. The lawnmower according to claim 1, wherein the discharge port of the cutter housing and the discharge port of the blower are connected to a glass bag provided at the rear of the machine body via a shooter. 4. A blower plate for guiding the wind generated by the blades provided at the tip of the cutter blade to the blower suction port is provided in the cutter housing. Lawn mower.