JP2013000055A - Lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lawn mower that enables a smooth mowing operation in which little lawn is left unmowed, while reducing the overall energy consumed.SOLUTION: The lawn mower includes a rough-mowing mower 8 for cutting planted lawn. A finish-mowing mower 9 for cutting the remaining lawn left unmowed by the rough-mowing mower 8 is provided in a state of being located behind the rough-mowing mower 8 along the longitudinal direction of a machine body.

Description

  The present invention relates to a lawn mower configured to mow the turf that is being planted while the aircraft is traveling.

  As a conventional lawn mower, a lawn mower provided with a rotary mower that cuts a lawn that has been planted by driving and rotating a substantially strip-shaped cutting blade around a longitudinal axis (see, for example, Patent Document 1) And a rotary cutting blade formed in a spiral shape and a fixed blade opposite to the rotary cutting blade. The rotary cutting blade is driven and rotated around the horizontal axis while the rotary cutting blade and the fixed blade are set in cooperation. There is a lawn mower equipped with a reel mower adapted to cut the lawn (see, for example, Patent Document 2).

JP 2009-296900 A JP-A-11-46544

  The rotary mower cuts the turf that is being planted while driving and rotating a substantially strip-shaped cutting blade around the axis of the vertical axis. In a lawn mower equipped with such a rotary mower, When the lawn is lying down, there is a possibility that the lawn cannot be cut at a desired cutting height. Therefore, a blade for raising wind is formed on the cutting blade so as to generate a wind for raising the turf by the blade, or a wind-up device for separately generating a wind for raising the turf is provided. In addition to the power for cutting the turf, extra power was required to generate the wind, and in this way, a large amount of power was required to raise the turf.

  In other words, in a lawn mower equipped with such a rotary mower, extra large power is required to raise the lawn so that there is no uncut residue, so it is compared with the power for cutting the lawn as a power source. There is a disadvantage that it is necessary to use an engine, an electric motor, or the like with an output larger than necessary, and the energy consumption becomes larger than necessary. If a small power source is used, the power is insufficient, so that the turf cannot stand up well, and a lot of turf is left behind.

  On the other hand, since the reel mower cuts the turf that has been planted by the cooperation of the rotary mowing blade and the fixed blade, the lawn mower equipped with such a reel mower has the turf being planted. Is relatively short, the turf can be cut satisfactorily in a state in which there is little risk of uncutting. However, if the turf being planted is tall, there is a disadvantage that it is difficult to cut because it can be sandwiched between the rotary cutting blade and the fixed blade, and a lot of turf remains are generated. is there.

  An object of the present invention is to provide a lawn mower that can reduce the amount of energy consumed as a whole while reducing the amount of uncut lawn and can perform a good lawn mowing operation.

  The first characteristic configuration of the lawn mower according to the present invention is provided with a mowing mower for cutting the turf being planted, and for finishing mowing for cutting the remaining turf left by the mowing mower. The mower is provided in a state of being located on the rear side in the front-rear direction of the aircraft with respect to the mowing mower.

  According to the first characteristic configuration, the mowing mower for cutting the planted lawn in a state in which the mowing mower for finishing mowing is located on the rear side in the front-rear direction of the aircraft from the mower for rough mowing, and the mowing mower for the mowing A mower for finishing mowing that cuts the remaining turf left by mower is provided.

  As the mower for rough mowing, there is a rotary mower that cuts the turf being planted while driving and rotating the cutting blade around the vertical axis. However, not only rotary mower but also flail mower can be used. The mower for finishing mowing is composed of a spirally-shaped rotating cutting blade and a fixed blade facing it. While rotating the rotating cutting blade around the horizontal axis, There is a reel mower that cuts grass that has been planted in cooperation. However, not only the reel mower but also a mower equipped with a clipper type cutting blade can be used.

  The turf that has been planted is cut by the mowing mower located on the front side in the longitudinal direction of the aircraft. At this time, even if the planted grass is tall, the mowing mower can cut the grass well. However, when the lawn is lying down, it is difficult to cut with the mowing mower that rotates the cutting blade around the axis of the vertical axis, and there is a risk that it will remain uncut. The grass that remains uncut can be cut well by the mowing mower that is located on the rear side in the front-rear direction.

  In other words, while mowing for rough mowing, there is no need to generate a large wind force for standing to raise the fallen turf during mowing, and no extra power is required to raise the turf. Thus, it is possible to perform lawn mowing work without cutting.

  Since a mower for finishing mowing is provided in addition to the mower for rough mowing, power for driving the mower for finishing mowing is required separately. However, the power for driving the mowing mower is smaller than the power for raising the turf by the mowing mower, so that the overall lawn mower can be reduced in energy consumption.

  Accordingly, it has become possible to provide a lawn mower that can reduce the amount of energy consumed as a whole and reduce the amount of uncut grass and perform a good lawn mowing operation.

  According to a second characteristic configuration of the present invention, the rough mowing mower is a rotary mower that rotates a cutting blade around a vertical axis, and the finishing mower is a reel mower that rotates a cutting blade around a horizontal axis. It is in.

  According to the second feature configuration, the rotary mower that rotates the cutting blade around the vertical axis cuts the grass by rotating the cutting blade around the vertical axis, so that the planted grass is tall. Even if it exists, the grass can be cut quickly and effectively. Further, since the reel mower is provided on the rear side of the rotary mower in the longitudinal direction of the machine body, uncut cuttings such as lying lawn that could not be cut by the rotary mower can be accurately cut by the reel mower.

  The reel mower cuts the turf that has been planted by the cooperation of the rotary cutting blade and the fixed blade. For example, when there is a hard foreign object such as a stone between the planted turf. There is a possibility that foreign matter may bite between the rotary cutting blade and the fixed blade, and the rotary cutting blade and the fixed blade may be damaged. However, since the reel mower is provided in a state of being located on the rear side in the longitudinal direction of the aircraft relative to the rotary mower, it exists between the planted grass by rotating the cutting blade around the vertical axis in the rotary mower. It is possible to blow away stones and the like that are out of the lawn mowing area by the reel mower due to the wind generated by the rotation of the cutting blade, and to prevent the reel mower from being damaged.

  In other words, even if the planted turf is lying down or there is a hard foreign object such as a stone between the planted turf, it is possible to provide a rotary mower and a reel mower, so This makes it possible to cut the turf accurately with little risk of damage.

  The third characteristic configuration of the present invention is that the rough mowing mower and the finish mowing mower are configured to be driven by electric motors provided separately.

  According to the third characteristic configuration, the mowing mower for rough mowing and the mowing mower for finishing mowing are driven by electric motors provided separately from each other, so that the power of the electric motor is directly cut without causing power loss. Can tell.

  That is, for example, the overall power consumption of the lawn mower is reduced by reducing the power loss of the lawn mower as a whole, compared to the case of using the power of the engine provided in the traveling machine to supply power using a transmission belt or the like. It becomes possible to reduce energy.

  A fourth characteristic configuration of the present invention is that the rough mower and the finish mower are provided in a state of being housed in a common housing.

  According to the fourth feature configuration, the mowing mower for rough mowing and the mower for finishing mowing are housed in a common housing, so that the mowing mower for rough mowing and the mowing mower for finishing mowing are adjusted by adjusting the vertical position of the housing. The cutting height can be adjusted at the same time, and there is no hassle such as adjusting them separately, which makes it easy to use.

It is the whole lawn mower side view. It is a whole top view of a lawn mower. It is a control block diagram.

Hereinafter, a lawn mower as an example of a work vehicle according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the lawn mower includes a pair of left and right front wheels 1 and 1 configured as caster wheels and a pair of left and right rear wheels 2 and 2 as a rotationally driven traveling device. And a lawn mowing device 4 for mowing the lawn as the traveling machine body 3 travels. The lawn mower 4 has a structure in which it is suspended and supported by a lower abdomen between the front and rear wheels of the traveling machine body 3 via a link mechanism 5 having a quadruple link structure. It is comprised so that it can raise / lower while maintaining.

  The lawn mower 4 is provided with a downwardly open cutting blade housing 7 having an upper surface 7A and a vertical wall portion 7B formed so as to extend downward from a peripheral portion of the upper surface. 7, a rotary mower 8 as a mower for rough mowing and a reel mower 9 as a mower for finishing mowing are accommodated. That is, as shown in FIGS. 1 and 2, the rotary mower 8 is positioned on the front side in the longitudinal direction of the machine body inside the blade housing 7, and the reel mower 9 is located on the rear side in the longitudinal direction of the machine body relative to the rotary mower 8. It is provided in a position.

  As shown in FIG. 2, the rotary mower 8 is a plane in which the three rotary cutting blades 8a, 8b, and 8c that are driven to rotate around the longitudinal axes Y1, Y2, and Y3 are slightly displaced forward in the center. Each of the rotary cutting blades 8a, 8b, 8c is supported by the upper surface 7a of the cutting blade housing 7 on the upper side of each rotary cutting blade 8a, 8b, 8c. Three cutting blade electric motors M1, M2 and M3 for rotating the blades 8a, 8b and 8c are provided, respectively. That is, the rotary cutting blades 8a, 8b, and 8c are configured to be independently driven to rotate by the cutting blade electric motors M1, M2, and M3.

  Each rotary cutting blade 8a, 8b, 8c is a well-known configuration and will not be described in detail. However, it is formed in a substantially strip shape and is driven around the longitudinal axis Y1, Y2, Y3 at the center in the longitudinal direction. It is configured to rotate, and a cutting action portion (not shown) formed on the edge on the upper side in the rotation direction cuts the turf on which it is planted.

  In the rotary mower 8, the rotary cutting blades 8a, 8b, and 8c are driven to rotate clockwise around the longitudinal axis Y1, Y2, and Y3 in a plan view (see FIG. 2). The turf that has been cut and cut is then discharged laterally outward from the discharge port 40 formed on the right side of the blade blade housing 7 in the width direction of the blade body 7 by the conveying wind generated by the rotation of the rotary blades 8a, 8b, and 8c. It is comprised so that it may discharge. An upper cover 41 that prevents dust contained in the cut grass from scattering toward the operation unit is provided at a location on the outer side of the discharge port 40.

As shown in FIGS. 1 and 2, two reel mowers 9 are provided in a state of being aligned in the horizontal direction of the fuselage, and each reel mower 9 is substantially spiral in a state of being driven to rotate about a lateral axis X. The rotary cutting blade 10 formed in a shape and the fixed blade 11 provided in a fixed position state are configured. The fixed blade 11 is attached and fixed to the lower end portion of the vertical wall portion 7B located on the rear side of the machine body in the cutting blade housing 7.
The left and right reel mowers 9 are provided along the lateral width direction in a state where the axis X of each rotary cutting blade 10 is located on the same axis.

  Each of the reel mowers 9 and 9 is configured to cut the turf by the cooperation of the rotary cutting blade 10 and the fixed blade 11. For example, even when the grass is lying down, the reel mowers 9 and 9 are effectively scraped up by the rotary cutting blade 10. Can be cut.

Each of the reel mowers 9 and 9 is configured to be rotationally driven by reel mower electric motors M4 and M5 (hereinafter referred to as reel electric motors) supported on the upper surface 7A of the cutting blade housing 7. The reel electric motors M4 and M5 are provided in a state in which the output shaft 12 protrudes downward toward the inner side of the cutting blade housing 7, and the output shaft 12 having a vertical rotation shaft core thereof, The drive shaft 13 of the rotary cutting blade 10 provided with the shaft core X is interlocked and connected by a worm gear reduction mechanism 14.
Since the rotary mowing blade 10 of the reel mower 9 cuts the turf in cooperation with the fixed blade 11, the rotational speed is lower than that of the rotary mowing blades 8a, 8b, 8c of the rotary mower 8, so that the output shaft 12 Is rotated by the worm gear speed reduction mechanism 14.

  As shown in FIGS. 1 and 2, a driving seat 15 is provided in the front and rear central portion of the traveling machine body 3. Below the driving seat 15, a pair of left and right rear wheels 2 and 2 are independently driven. A pair of left and right traveling electric motors 16R and 16L are provided in a state where they are arranged side by side. In addition, traveling gearshift levers 17R and 17L as a pair of left and right gearshift operating tools that can be manually operated independently and perform gearshift operations on the left and right rear wheels 2 and 2 can swing back and forth on the left and right sides of the driver seat 15. Has been deployed. The pair of left and right traveling electric motors 16R and 16L are separately operated by the traveling speed change levers 17R and 17L, so that the left and right rear wheels 2 and 2 are independently shifted forward and backward. .

  In the vicinity of the left and right rear wheels 2, 2 driven by the pair of left and right electric motors 16R, 16L, a brake B for braking the left and right rear wheels 2 is provided. The brake B and the brake operation tool 18 are mechanically linked so as to brake the left and right rear wheels 2 by operating the brake operation tool 18 provided in the step.

  Both the left and right rear wheels 2 and 2 can be driven forward in the forward direction at the same speed, and both the left and right rear wheels 2 and 2 can be driven in the reverse direction at the same speed in the forward direction. Reverse travel can be performed. Further, by making the speeds of the left and right rear wheels 2 and 2 different from each other, the traveling machine body 3 can be turned in an arbitrary direction. For example, one of the left and right rear wheels 2 and 2 is set to zero speed. By making the speed close to low and operating the other rear wheel 2 forward or backward at high speed, it is possible to make a small turn. Further, by driving the left and right rear wheels 2 and 2 in opposite directions, the traveling machine body 3 can be spin-turned with the substantially central portion of the left and right rear wheels 2 and 2 as the turning center.

  The pair of left and right front wheels 1, 1 are configured as caster wheels and can be freely changed in direction around the longitudinal axis, so that the direction is corrected according to the driving direction by driving the left and right rear wheels 2, 2. Will be.

  As shown in FIG. 1, driving electric power is supplied to the rear part of the traveling machine body 3 to the electric motors M1, M2, and M3 for cutting blades, the electric motors M4 and M5 for reels, and the electric motors 16R and 16L for traveling. A battery 19 is provided. As shown in FIG. 3, the power supply paths 20, 21 from the battery 19 to the left and right traveling electric motors 16R, 16L are respectively adjusted by changing the voltage, current, or frequency to adjust the traveling electric motor 16R. , 16L are provided with motor controllers 22 and 23 for controlling the driving state, and the electric power supply paths 20 and 21 are cut off between the electric motors 16R and 16L for traveling and the motor controllers 22 and 23 corresponding thereto, respectively. Electromagnetic switches 24 and 25 are provided.

  Incidentally, as the left and right traveling electric motors 16R and 16L, various ones such as a three-phase AC induction electric motor and a brushless DC motor can be used. It is configured with a device and the like.

  Further, the cutting blade electric motors M1, M2, M3 and the pair of electric power supply paths 26 from the battery 19 to the three electric motors M1, M2, M3 and the pair of reel electric motors M4, M5 are provided. A motor controller 27 for controlling the driving state of the reel electric motors M4 and M5 is provided. The cutting blade electric motors M1, M2, M3 and the pair of reel electric motors M4, M5 can be various types such as a three-phase AC induction electric motor and a brushless DC motor.

As shown in FIG. 1, an auxiliary battery 28 that assists electric power for the battery 19 is mounted at the front end of the traveling machine body 3. The auxiliary battery 28 is provided in a state of being housed in a storage box 29 fixed to the traveling machine body 3, and the upper portion of the storage box 29 is covered with a lid 30 that is detachably screwed so as to be freely opened and closed. It is said.
By arranging the auxiliary battery 28 at the front of the aircraft in this way, for example, even when a heavy equipment such as a grass collector is added to the rear of the aircraft, the front and rear weight balance of the aircraft is It is possible to avoid being too heavy.

  As shown in FIG. 3, the target speeds for the electric motors 16R and 16L for travel are set, and control signals are sent to the motor controllers 22 and 23 to control the operations of the electric motors 16R and 16L. A control device H is provided as a control means. The electric power for the control device H is supplied by converting the voltage (about 48 V) of the battery 19 into a low voltage (about 12 V) via the DC / DC converter 31.

  Further, a brake switch 32 is provided in the vicinity of the brake operating tool 18 which is turned on when the return-biased brake operating tool 18 is depressed and is turned off when the depressed operation is not performed, and driving of the lawn mower 4 is started. Is provided on the side of the driver's seat 15 and turned on when a stop command is issued. The detection information is also input to the control device H. Yes.

  When the brake switch 32 is turned on, the control device H switches the left and right electromagnetic switches 24 and 25 to the cut-off state to stop the driving of the electric motors 16R and 16L for traveling. The devices 24 and 25 are switched to the conductive state to restart the driving electric motors 16R and 16L. When the mower on / off switch 33 is turned on, the electric motors M1, M2, and M3 for cutting blades and the pair of electric motors for reels M4 and M5 are driven, so that the three rotary cutting blades 8a and 8b of the rotary mower 8 are driven. , 8c and the respective rotary mowers 9 of the reel mowers 9 are rotated to perform the mowing work by the lawn mower 4 and when the mower on / off switch 33 is turned off, the electric motors M1, M2, M3 for the mowing blades and the pair Each of the electric motors M1, M2, M3 for cutting blades and the pair of electric motors M4, M5 for reels is stopped so that the rotation of the electric motors M, M5 for reels is stopped and the mowing work by the lawn mower 4 is stopped. It is configured to control operation.

  As shown in FIG. 3, there are provided operation position detectors 34R and 34L as speed change operation position detecting means comprising a pair of potentiometers for detecting the operation positions of the travel speed change levers 17R and 17L, and this pair of operation position detectors. The detection information of 34R and 34L is input to the control device H.

  In addition, rotation sensors 35R and 35L are provided as rotation speed detecting means including a pair of rotary encoders that detect the rotation speeds of the left and right rear wheels 2 and 2 driven by the left and right traveling electric motors 16R and 16L. The detection information of the rotation sensors 35R and 35L is also input to the control device H.

  And the control apparatus H sets the target speed with respect to each of the electric motors 16R and 16L for traveling based on the detection information of the operation positions of the traveling speed change levers 17R and 17L detected by the operation position detectors 34R and 34L. Then, control signals are sent to the motor controllers 22 and 23 so that the speeds of the left and right rear wheels 2 and 2 detected by the rotation sensors 35R and 35L become the target speeds, and the electric motors 16R, 16 It is configured to control the operation of 16L.

  That is, both the left and right traveling speed change levers 17R and 17L are swung forward by the same amount, so that both the left and right rear wheels 2 and 2 can be driven in the forward direction at the same speed and can be moved straight forward. By swinging both the left and right traveling speed change levers 17R and 17L backward by the same amount, both the left and right rear wheels 2 and 2 can be driven in the reverse direction at the same speed, and the vehicle can go straight.

  Further, by changing the operating positions of the left and right traveling speed change levers 17R, 17L and making the speeds of the left and right rear wheels 2, 2 different from each other, the traveling machine body 3 can be turned in any direction, By turning one of the rear wheels 2 and 2 to a low speed close to zero speed and operating the other rear wheel 2 to the forward side or the reverse side at a high speed, it is possible to make a small turn.

  The left and right traveling shift levers 17R, 17L are operated in opposite directions from the neutral position, and the left and right rear wheels 2, 2 are driven in opposite rotation directions, whereby the traveling body 3 is moved to the left and right rear wheels 2, 2. It is also possible to make a spin turn with the approximate center of 2 as the center of rotation. The pair of left and right front wheels 1 and 1 are caster wheels and can be freely changed in direction around the center of the vertical axis, so that the direction follows the change in the traveling direction by driving the left and right rear wheels 2 and 2. Will be changed.

And the control apparatus H is comprised so that the rotation speed of the electric motor M1, M2, M3 for cutting blades may be controlled so that the energy consumption by the lawn mowing apparatus 4 may be reduced as much as possible.
In other words, when the rotary cutting blades 8a, 8b, and 8c of the rotary mower 8 are rotated at a high speed, the cutting performance is improved, but a large driving force is required, and the energy consumption as a whole increases accordingly. Therefore, in order to reduce energy consumption as much as possible, it is better to reduce the rotational speed of the rotary cutting blades 8a, 8b, 8c. However, if the rotational speed is too low, a large amount of uncutting occurs and the reel mowers 9, 9 There is a possibility that the driving load on the battery becomes excessive.

  Therefore, the controller H detects the current value flowing through the electric motors M4 and M5 for the reel by the motor controller 27, and determines the magnitude of the driving load in the reel mowers 9 and 9 based on the current value. Thus, the rotational speeds of the cutting blade electric motors M1, M2, and M3 are controlled so that the detected driving load on the reel mowers 9 and 9 falls within the set range. In this way, energy consumption as a whole is reduced as much as possible.

[Another embodiment]
(1) In the above-described embodiment, the vertical output shaft 12 of the electric motors M4 and M5 for reels and the drive shaft 13 of the reel mower 9 are interlocked and connected by the worm gear reduction mechanism 14, but for example, It may be linked with a reduction bevel gear mechanism, and the reel electric motors M4 and M5 are arranged on the lateral side of the reel mower 9 and the laterally outer side of the cutting blade housing 7 with the output shaft 12 oriented sideways. It is good also as a structure arrange | positioned in the state located in a part.

(2) In the above embodiment, the rotary mower 8 and the reel mower 9 are configured to be driven by the electric motors M1 to M5 provided separately, respectively, and the rear wheels 2 of the traveling machine body 3 are driven by the electric motors 16R, Although the configuration of driving at 16L is shown, the following configuration may be used instead of such a configuration.
A configuration in which the rotary mower 8 and the reel mower 9 are driven by the electric motors M1 to M5, an engine (not shown) is mounted on the traveling machine body 3, and the rear wheels 2 of the traveling machine body 3 are driven by the power of the engine. Also good. In addition to the configuration in which the rear wheel 2 of the traveling machine body 3 is driven by the engine power, the rotary mower 8 and the reel mower 9 may be driven by the engine power.

(3) In the above-described embodiment, the rotary mower 8 and the reel mower 9 are provided in a state of being housed in the common cutting blade housing 7. However, the rotary mower 8 and the reel mower 9 are respectively provided in different housings. It is good also as a structure to accommodate.

Further, in the configuration in which the rotary mower 8 and the reel mower 9 are respectively housed in different housings, the rotary mower 8 and the reel mower 9 are replaced with a configuration in which the rotary mower 8 and the reel mower 9 are provided in the lower abdomen between the front and rear wheels in the traveling machine body 3 as follows. It may be configured as described in (3-1), (3-2), and (3-3).
(3-1) A configuration in which the rotary mower 8 is provided in the lower abdomen between the front and rear wheels in the traveling machine body 3 and the reel mower 9 is provided on the rear side of the rear wheel 2.
(3-2) A configuration in which the rotary mower 8 is provided in a state of being located on the front side of the machine body from the front wheel 1 of the traveling machine body 3, and the reel mower 9 is provided in the lower abdomen between the front and rear wheels in the traveling machine body 3.
(3-3) A configuration in which the rotary mower 8 and the reel mower 9 are provided in a state of being positioned on the front side of the vehicle body relative to the front wheels of the traveling vehicle body 3 in a state where the rotary mower 8 is positioned on the front side in the longitudinal direction of the vehicle body relative to the reel mower 9. .

(4) In the above embodiment, the rotary mower 8 is used as the rough mower and the reel mower 9 is used as the finish mower. Instead of such a configuration, for example, a flare mower is used as the rough mower. Alternatively, a clipper type mower may be used as the mowing mower for finishing mowing.

  The present invention can be applied to a lawn mower configured to mow the turf planted while the aircraft is traveling.

7 Housing 8 Rough mower (rotary mower)
8a, 8b, 8c Cutting blade 9 Finishing mower (reel mower)
10 Cutting blade M1 to M5 Electric motor X Horizontal axis Y1, Y2, Y3 Vertical axis

Claims (4)

  A mower for rough mowing that cuts the turf being planted is provided, and the mower for finishing mowing that cuts the remaining turf left by the mowing mower is longer than the mower for rough mowing. A lawn mower provided in a state of being located on the rear side.   The lawn mower according to claim 1, wherein the mowing mower is a rotary mower that rotates a cutting blade around a vertical axis, and the finishing mower is a reel mower that rotates a cutting blade around a horizontal axis.   The lawn mower according to claim 1 or 2, wherein the mowing mower and the mowing mower are configured to be driven by electric motors provided separately.   The lawn mower according to any one of claims 1 to 3, wherein the mower for rough mowing and the mower for finishing mowing are provided in a state of being housed in a common housing.

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