KR101894369B1 - Lawn mower - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower, and more particularly, to a mower that can automatically adjust the height of a cutting blade cutting grass according to the state or topography of the lawn.
The lawn mower can be controlled wirelessly or automatically by means of the lawn mower controller according to the present invention, thereby reducing the risk of waste of manpower and work, thereby performing safe work.
Further, in the uneven landform of the lawn mower according to the present invention, when the body is tilted or rolled over to one side by the irregular structural topography on the working path, it is automatically stopped to prevent a safety accident due to breakage and scattering of fragments, There is an advantage that the length of grass can be maintained uniformly with respect to the ground.

Description

Lawn mower {Lawn mower}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower, and more particularly, to a mower that can automatically adjust the height of a cutting blade cutting grass according to the state or topography of the lawn.

Generally, a grass cutter is installed on a rectangular or elliptical body, a wheel is mounted on the body, the engine is mounted on the body, the rotation shaft of the engine is fixed to the ground so as to penetrate the body, So that the cutting blade is rotated in accordance with the rotation of the engine, so that the grass can be cut.

Conventional lawn mowing always requires minimal manpower because the operator must always ride on a lawn mower or hold the handle attached to the body. This is an inefficient problem not only in terms of loss of manpower but also in utilization of working time.

Further, the height of the wheel or the cutting blade is manually adjusted while the grass mower is stopped so that the conventional lawn mowing lawn is left only a desired length. Therefore, in order to prevent collision of the cutting edge during work on the work surface of the obstacle including the stone and the concavo-convex structure, the grass mower is stopped at any time according to the ground condition of the obstacle and the concavo-convex structure to adjust the height.

KR 20-0108815 Y1 KR 20-1999-0038701 U KR 10-2010-0032488 A

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a grass mower which is capable of wirelessly or automatically controlling a lawn mower through a controller, The purpose is to provide.

When the body is tilted or rolled over to one side by uneven landform on the uneven ground, it is automatically stopped to prevent safety accidents caused by breakage and shattering, and the length of grass Another object is to provide a mower that can maintain uniformity.

In order to accomplish the above object, the present invention provides a lawn mower according to the present invention; A traveling unit including a traveling wheel installed on the main body to movably support the main body, and a traveling driving motor for rotating the traveling wheel; A cutting blade for cutting grass while rotating in a horizontal direction at a lower portion of the main body; and a rotation driving motor installed to be movable up and down in the main body and rotating the cutting blade; A height adjusting unit for adjusting a height of the cutting blade with respect to the main body; And a drive control unit for controlling operations of the traveling unit, the cut unit, and the height adjustment unit, wherein the height adjustment unit is installed in the main body, and the inside of the height adjustment unit is provided with a guide A movable cover installed to surround the rotation driving motor and installed to be movable up and down along the guide cover and having a lower end exposed or inward to the outside of the main body; A movable screw having a hollow portion formed therein for allowing the guide screw to pass therethrough and a first screw portion formed on an inner circumferential surface of the hollow portion so as to be screwed to the moving screw portion of the guide screw and having gear teeth formed on an outer circumferential surface thereof; And an elevation drive motor for rotating the elevation drive motor.

Wherein the movable cover includes a lower portion provided with a connection support portion for rotatably connecting a connection portion for connecting the rotary shaft of the rotary drive motor and the cutting blade, The lower end of the guide cover is fixed to the main body and the lower end of the guide cover is inserted inwardly so as to catch the first expansion flange so as to restrict the lowering position of the movable cover And a mounting space portion extending outward from one side of the extended space portion to mount the driving gear of the elevation driving motor is provided at an upper portion thereof and an enlarged space portion extended to correspond to the outer diameter of the movable screw is provided at an upper portion thereof, And a second expansion flange corresponding to the first expansion flange is provided at a lower end of the guide screw.

A traveling control signal for controlling the traveling drive motor to the drive control unit by an operator's operation, a rotation control signal for controlling the rotation drive motor, and a lift control signal for controlling the lift motor, And an operation unit which can be sent to the control unit.

And the operation unit is capable of wireless communication with the drive control unit.

The operation unit is further provided with a mode selection unit for operating the drive control unit in a manual mode or an automatic mode.

Further comprising a distance measuring sensor for measuring a distance between the main body and the ground when the automatic mode is selected by the operation unit, wherein the driving control unit controls the operation of the elevation driving motor according to the distance information measured by the distance measuring sensor Is automatically controlled.

And a protective cover for protecting the cutting edge, wherein the protective cover is opened at the lower part, and the upper part is fixed to the lower end of the movable cover so as to move up and down together with the cutting blade, And a plurality of entry slots are formed on the side of the edge so as to enter the predetermined length so as to allow the grass to enter the inside of the protective cover and spaced apart at predetermined intervals along the circumferential direction.

The driving unit further includes a load cell for detecting a load acting on the traveling wheel with respect to the main body, and the driving control unit stops the operation of the rotation driving motor when the load measured by the load cell is out of a set reference range .

The lawn mower can be controlled wirelessly or automatically by means of the lawn mower controller according to the present invention, thereby reducing the risk of waste of manpower and work, thereby performing safe work.

Further, in the uneven landform of the lawn mower according to the present invention, when the body is tilted or rolled over to one side by the irregular structural topography on the working path, it is automatically stopped to prevent a safety accident due to breakage and scattering of fragments, There is an advantage that the length of grass can be maintained uniformly with respect to the ground.

1 is a perspective view of a lawn mower according to the present invention;
2 is a block diagram showing a control system of a lawn mower according to the present invention;
3 is a partially cutaway perspective view showing a cutting portion and a height adjusting portion of the mower according to the present invention.
Fig. 4 is an exploded perspective view of the cutout portion and the height adjustment portion shown in Fig. 3; Fig.
FIG. 5 is a sectional view for explaining an operation in which a cutting portion is lowered by a height adjusting portion of a lawn mower according to the present invention. FIG.
6 is a cross-sectional view for explaining an operation in which the cutting portion is lowered by the height adjusting portion of the lawn mower according to the present invention.

Hereinafter, a mower according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 6 show a lawn mower according to the present invention. 1 to 6, a lawn mower main body according to the present invention, a traveling unit 200, a cutting unit 300, a height adjusting unit 400, a driving control unit 500, and an operating unit 600 do.

 The main body includes a lower frame 110 and a driving motor 220 of the driving unit 200 to be described later and a rotation driving motor of the cutting unit 300 between the lower frame 110 and the lower frame 110, And an upper frame 120 which forms a mounting space 110 in which the elevation driving motor 450 of the height adjusting unit 400 and the battery B can be installed.

The traveling unit 200 includes a main traveling wheel 210 installed on both sides of the front side of the main body and a lower frame 110 for rotating the main traveling wheel 210, A power transmitting portion provided on the lower frame 110 to transmit rotational force of the traveling driving motor 220 and the traveling driving motor 220 to the traveling wheels 210 and a power transmitting portion provided on both sides of the rear side of the main body, (250).

The power transmission unit includes a driving gear rotated by the driving driving motor 220 and a driving shaft 232 fixed to the driving wheel 210 at one end and a driving shaft 232 at the other end, And a driven gear to be engaged.

The cutting unit 300 is for cutting grass or weeds, and is installed at the center of the lower frame 110 of the main body. The cutting unit includes a cutting blade 310 for cutting grass while rotating in a horizontal direction at a lower portion of the main body, a rotation driving motor 320 installed in the lower frame 110 so as to be movable up and down in the main body, .

The cutting blade 310 has a fixing portion fixed to a connection portion 350 for connection with a rotation axis of the rotation driving motor 320 and a first cutting blade extending in a direction facing each other from the edge of the fixing portion, Each of the first cutting blade and the second cutting blade extends obliquely downward from the fixing portion at an angle, and the end portion is bent and extended in the horizontal direction. The connection unit 350 includes a shaft receiving unit 351 into which the rotation shaft of the rotation driving motor 320 is inserted, a fixing block 352 extending from the shaft receiving unit 351 and fixed to the fixing unit of the cutting blade 310, And a bearing member 353 for rotatably supporting the movable member 351 with respect to the movable cover 420 of the height adjusting unit 400 to be described later.

The rotation driving motor 320 is installed to move up and down with respect to the main body together with the height adjusting unit 400 while being fixed in the height adjusting unit 400.

The height adjusting unit 400 is for adjusting the height of the cutting blade 310 and the rotation driving motor 320 with respect to the body and includes a guide cover 410, a movable cover 420, a guide screw 430, A movable screw 440, and an elevation driving motor 450.

A lower end of the guide cover 410 is installed and fixed to the lower frame 110, and a movement passage is provided inside the guide cover 410 so that the rotation drive motor 320 can move up and down. The guide cover 410 is disposed inside the movable cover 420 so that the first extension flange 421 formed on the movable cover 420 is engaged with the lower portion of the guide cover 410 so as to restrict the lowering position of the movable cover 420, A drawn-in portion is formed.

The guide cover 410 is provided at an upper portion thereof with an enlarged space portion corresponding to the outer diameter of the movable screw 440 and is provided at one side of the extended space portion to mount the drive gear 451 of the elevation drive motor 450 A mounting space portion extending outwardly is provided.

Reference numeral 415 denotes a lid for opening and closing the open top of the guide cover 410.

The movable cover 420 is formed and installed so as to surround the rotation driving motor 320 and is installed to be movable up and down along the guide cover 410. The lower end of the cover 420 is exposed to the outside of the main body.

The movable cover 420 is provided with a connection support portion for rotatably mounting a connection portion 350 for connecting the rotary shaft of the rotary drive motor 320 and the cutting blade 310, A first expanding flange 421 extending radially therefrom is formed.

Although not shown, one end is fixed to the movable cover 420 and the other end is fixed to the bottom surface of the main body between the movable cover 420 and the main body so that the gap between the movable cover 420 and the main body And a blocking member for blocking inflow of cut grass leaves or grass. In this case, the blocking member may have a bellows structure so that the length of the blocking member can be varied corresponding to the upward / downward movement of the movable cover 420.

The guide screw 430 is for vertically moving the movable cover 420 by the rotation of the movable screw 440. The guide screw 430 is fixed to the upper portion of the movable cover 420, And a moving threaded portion for moving in the up and down direction is formed on the outer circumferential surface.

A second extension flange 432 is provided at a lower end of the guide screw 430 at a position corresponding to the first extension flange 421 provided in the movable cover 420 and having a diameter expanded in the radial direction. The second expansion flange 432 is firmly fixed to the first expansion flange 421 through a fixing bolt or the like.

The movable screw 440 has a hollow portion formed therein so that the guide screw 430 can pass and move in the up and down direction and a first threaded portion that is screwed to the moving screw portion of the guide screw 430 is formed on the inner circumferential surface of the hollow portion And gear teeth (teeth) that mesh with the driving gear 451 coupled to the rotation shaft of the elevation driving motor 450 are formed on the outer circumferential surface. The movable screw 440 is rotated by the rotational force of the elevation driving motor 450 to move the guide screw 430 on the inside up and down.

At this time, the movable cover 420 coupled with the guide screw 430 to move together with the guide screw 430 rotates the guide screw 430 together with the movable screw 440 when the movable screw 440 rotates And the lower portion of the guide cover 410 to which the movable cover 420 is coupled is also formed in a shape corresponding to the shape of the movable cover 420 so that the movable cover 420 and the guide screws 430 Is prevented from rotating.

The elevating driving motor 450 rotates the movable screw 440. The elevating driving motor 450 is provided with a rotating shaft in a mounting space provided at one side of the guide cover 410, The gear 451 is fixed.

The drive control unit 500 controls operations of the travel driving motor 220 of the traveling unit 200, the rotation driving motor 320 of the cutting unit 300 and the elevation driving motor 450 of the height adjusting unit 400 And controls the rotation direction and rotation speed of the travel drive motor 220, the rotation direction and rotation speed of the rotation drive motor 320, the rotation direction and rotation speed of the lift motor 450, and the like.

The operation unit 600 allows the operator to transmit a control signal to the drive control unit 500 at a long distance, and is capable of wireless communication with the drive control unit 500. The operation unit 600 includes a drive control unit 500 for controlling the drive motor 220 and a rotation control signal for controlling the rotation drive motor 320 and an elevation drive motor 450 To the drive control unit 500, respectively. The operation unit 600 includes a joystick 610 for adjusting the moving direction and a mode selection unit 620 and an on / off button 630 for operating the drive control unit 500 in the manual mode or the automatic mode do.

Meanwhile, the distance measuring sensor 700 may measure the distance between the main body of the lawn mower and the ground according to the present invention. In this case, when the operator selects the automatic mode through the operation unit 600, the drive control unit 500 receives the distance information measured by the distance measuring sensor 700, and controls the elevation driving motor 450 in accordance with the received distance information. Thereby automatically controlling the operation of the apparatus.

In addition, the present invention further includes a protective cover 800 for protecting the cutting edge 310 from the mowing stones, ropes, ropes, etc. according to the present invention.

The protective cover 800 is opened at the bottom and fixed to the lower end of the movable cover 420 so as to move up and down together with the cutting edge 310. The cutting edge 310 is rotatably supported And a plurality of entry slots 801 are formed on the side of the edge so as to enter the predetermined length so as to allow the grass to enter the inside of the protective cover 800 and to be spaced a predetermined distance along the circumferential direction.

In addition, the load cell 250 may be further provided on the lawn mower traveling unit 200 according to the present invention.

The load cell 250 detects a load acting on the traveling wheel 210 with respect to the main body and transmits the detected load to the driving control unit 500. Then, the drive control unit 500 stops the operation of the rotation drive motor 320 when the load information measured by the load cell 250 is out of the set reference tolerance range. For example, when the main body is tilted so that the traveling wheels 210 on one side are away from the ground, the load of the main body is biased to the traveling wheels 210 other than the traveling wheels 210 and the load acting on the traveling wheels 210 If it is less than the set reference allowable range, it is possible to prevent an accident such as the overturning of the main body by stopping the travel driving motor 220. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. will be. Accordingly, the true scope of protection of the present invention should be determined only by the technical idea of the appended claims.

110: Lower frame
120: upper frame
200:
210: Driving wheels
220: Driving drive motor
230: Power transmission unit
300:
310: cutting blade
320: Rotary drive motor
400:
410: guide cover
420: movable cover
430: guide screw
440: Movable screw
450: Lift motor
500:
600:
700: Distance measuring sensor
800: protective cover
801: Entry Slot

Claims (8)

A body;
A traveling unit including a traveling wheel for movably supporting the main body, and a traveling driving motor for rotating the traveling wheel;
A cutting blade for cutting grass while rotating in a horizontal direction at a lower portion of the main body; and a rotation driving motor installed to be movable up and down in the main body and rotating the cutting blade;
A height adjusting unit for adjusting a height of the cutting blade with respect to the main body;
And a drive control section for controlling operations of the traveling section, the cut section, and the height adjustment section, respectively,
The height adjusting unit includes a guide cover installed in the main body and having a moving path for moving the rotation driving motor up and down, and a guide cover installed to surround the rotation driving motor and movable up and down along the guide cover. A guide screw formed on an upper surface of the movable cover and having a moving screw portion formed on an outer circumferential surface thereof; a hollow portion through which the guide screw can pass; A movable screw having a first threaded portion screwed to the moving screw portion of the screw and having a gear teeth formed on an outer circumferential surface thereof, and an elevation driving motor for rotating the movable screw.
The method according to claim 1,
Wherein the movable cover includes a lower portion provided with a connection support portion for rotatably connecting a connection portion for connecting the rotary shaft of the rotary drive motor and the cutting blade, Is formed,
The guide cover is provided with the moving passage, the lower end is fixed to the main body, and the lower end of the guide cover is formed with an inwardly drawn-in portion for catching the first expanding flange so as to limit the lowering position of the movable cover A mounting space portion extending from one side of the extended space portion to mount the driving gear of the elevation driving motor is provided on the upper portion, an extended space portion extended to correspond to the outer diameter of the movable screw,
And a second expansion flange corresponding to the first expansion flange is provided at a lower end of the guide screw.
3. The method of claim 2,
A driving control signal for controlling the traveling drive motor to the drive control unit by an operation of an operator, a rotation control signal for controlling the rotation drive motor, and a lift control signal for controlling the lift motor, And a control unit for controlling the operation of the mower.
The method of claim 3,
Wherein the operation unit is capable of wirelessly communicating with the drive control unit.
The method of claim 3,
Wherein the operation unit is further provided with a mode selection unit for operating the drive control unit in a manual mode or an automatic mode.
6. The method of claim 5,
And a distance measuring sensor for measuring a distance between the main body and the ground,
Wherein the driving control unit automatically controls the operation of the elevation driving motor according to the distance information measured by the distance measuring sensor when the automatic mode is selected on the operation unit.
3. The method of claim 2,
And a protective cover for protecting the cutting edge,
The protective cover is opened at its lower part, and the upper part is fixed to the lower end of the movable cover so as to move up and down together with the cutting blade. A rotating space part is formed inside the protective cover so that the cutting blade can rotate. Wherein a plurality of entry slots are formed in a predetermined length so as to enter the inside of the protective cover and spaced apart from each other by a predetermined distance along the circumferential direction.
The method according to claim 1,
The traveling unit further includes a load cell for detecting a load acting on the traveling wheel with respect to the main body,
Wherein the drive control unit is configured to stop the operation of the rotation drive motor when a load measured by the load cell is out of a set allowable range.

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