JP7518535B2 - Grass cutter, grass cutting device, grass cutting method, and power mechanism - Google Patents

Description

The present invention relates to a grass cutter, a grass cutting device, a grass cutting method, and a power mechanism. More specifically, the present invention relates to a grass cutter, a grass cutting device, a grass cutting method, and a power mechanism that can be suitably used by remote control while having a relatively simple structure.

Mowing is a task that is performed frequently and regularly on farmland, pastures, golf courses, etc., and walk-behind and ride-on self-propelled mowers have been in widespread use for some time. However, when working on uneven ground such as slopes, ride-on self-propelled mowers run the risk of tipping over, and walk-behind mowers run the risk of either the operator or the mower tipping over, or both, and involve a large workload.

In order to solve these problems, a remote-controlled grass cutter has been proposed, as described in Patent Document 1, for example. This remote-controlled grass cutter has a cutting blade that rotates horizontally driven by an engine, and a travel means that can move forward or backward using the engine as power, and is characterized by having a control device that receives operation signals from a remote transmitter located away from the grass cutter and issues commands to control the engine speed, forward/reverse switching, and travel speed and direction based on the operation signals.

The remote-controlled grass cutter described in Patent Document 1 allows the operator to remotely operate the grass cutter from a safe location, eliminating the need for the operator to actually stand on the slope while working, eliminating the risk of tripping or falling off the slope, and eliminating the risk of the rotating cutting blade hitting pebbles or other foreign objects that could strike the operator's eyes or body.

JP 2011-142900 A

The remote-controlled grass cutter described in Patent Document 1 is operated by an operator from a distance. However, because the grass cutter is driven by an engine, if the engine runs out of fuel and the grass cutter stops at a location far from the operator, the operator must either go to the location where the grass cutter stopped and retrieve it, or refuel and return the grass cutter.

However, when recovering the machine, it is necessary to tow the machine, which weighs at least several tens of kilograms, which places a great physical burden on the worker when done manually, and when using a vehicle, it is time-consuming to drive the vehicle close to the stopping place, connect the vehicle to the grass cutter, and tow it away from the site. On the other hand, when refueling the machine, not only is it labor-intensive to transport and refuel the fuel, but it also means pouring flammable fuel at the work site, which can pose a risk of fire due to fuel leakage.

The present invention was devised in consideration of the above points, and aims to provide a mower, a grass cutting device, a grass cutting method, and a power mechanism that are relatively simple in structure and can be suitably used by remote control.

In order to achieve the above object, the grass cutter of the present invention is provided with a traveling means unit, a working unit that cuts grass, a power mechanism unit capable of driving the working unit and the traveling means unit, a signal transmission/reception unit with the outside of the machine, and a control unit capable of controlling each unit of the machine based on a signal received via the signal transmission/reception unit, and the working unit and the power mechanism unit are provided with an engine including a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a first motor including a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, a third shaft that rotates by receiving a driving force from the first motor, a fourth pulley provided on the third shaft, and a grass cutter connected to the third shaft and driven by the power transmitted to the third shaft. The engine has a working unit having a pulley, a first belt wound around the first pulley and the second pulley, and a second belt wound around the third pulley and the fourth pulley. The engine has a starting function in which the power of the first motor driven by the battery is transmitted to the first shaft via the first belt to rotate the first shaft, and a power generation and storage function in which the power of the engine is transmitted to the second shaft via the first belt to constantly rotate the second shaft in an operating state other than a stopped state due to fuel shortage, and the first motor generates electricity and stores the generated electricity in the battery. The cutter drive function drives the working unit with the power transmitted to the third shaft via the second belt.

The grass cutter of the present invention is equipped with the above-mentioned travel means unit, working unit, power mechanism unit, signal transmission/reception unit and control unit on the machine body, and receives a signal to operate the machine from outside the machine (e.g., a wired or wireless controller) via the signal transmission/reception unit, and the control unit controls each part of the machine including the travel means unit, working unit and power mechanism unit based on the signal received via the signal transmission/reception unit, thereby allowing the machine to travel and perform grass cutting work. The signal transmission/reception unit can also transmit information on each part of the machine transmitted to the control unit to an external controller, etc., making the information perceptible to a user such as an operator.

In the aforementioned power mechanism, when the vehicle is in an operating state other than when it is stopped due to running out of fuel (in other words, at all times during normal operation), the engine power is transmitted to the second shaft via the first belt that is wound around the first pulley and the second pulley, and the second shaft is rotated at all times, generating electricity by the first motor. The electricity generated by the first motor is then stored in the battery.

The power mechanism unit described above uses the power stored in the battery to drive the first motor, and the power of the first motor is transmitted to the first shaft via the first belt, causing the first shaft to rotate, thereby starting the engine. In other words, the power mechanism unit makes it possible to start an engine without a starter (for example, an engine with a recoil starter) in the same way as an engine with a starter.

The power mechanism unit described above is configured such that "in an operating state except a stopped state due to fuel shortage, the engine power is transmitted to the second shaft via the first belt to rotate the second shaft at all times," and when the engine stops due to fuel shortage, "power is not transmitted to the second shaft via the first belt." Note that a clutch or the like can be cited as a means for realizing the configuration in which "power is not transmitted to the second shaft via the first belt," and the transmission of power between the engine and the first motor via the first belt is interrupted.

By cutting off the transmission of power when the engine has stopped due to running out of fuel, it is possible to suppress damage to the internal mechanism and damage to the first shaft and first pulley caused by forcibly running the engine that has run out of fuel using the power transmitted to the first shaft. Furthermore, with the power mechanism unit described above, even if the engine has stopped due to running out of fuel in a location far from the operator, for example, the power stored in the battery can be used to drive the traveling means unit, making it possible to return the grass cutter without the effort of going to retrieve the machine. In addition, if the design is such that there is some leeway, for example by installing a large-capacity battery, it is also possible to return the grass cutter after continuing grass cutting work to a certain extent.

The traveling means unit is structured to be driven by power from the first motor, or by electricity generated by the first motor and stored in a battery. Here, "a structure driven by power from the first motor" refers to, for example, a structure having a power transmission mechanism such as a gear, shaft, belt, pulley, etc. between the axle of the start wheel of the traveling means unit and the first motor, and the power from the first motor directly drives the start wheel. Also, "a structure driven by electricity generated by the first motor and stored in a battery" refers to a structure having a motor other than the first motor that drives the axle of the start wheel of the traveling means unit, and driving the start wheel by driving the other motor with electricity from the battery.

In the grass cutter of the present invention, the engine power is transmitted via the second shaft provided with the third pulley, and is transmitted via the second belt to the working section provided with the fourth pulley, and the grass cutting knife section provided in the working section is driven by the power. This enables the grass cutter to cut grass. In addition, according to the configuration of the working section and the power mechanism section described above, if the load increases due to a large amount of target vegetation or the vegetation is hard, and an overload occurs, further power can be added from the first motor (power assist function).

Furthermore, the aforementioned working unit and power mechanism unit have a power transmission mechanism that is a combination of pulleys and belts, and therefore has a simpler and lighter structure than power transmission mechanisms that are a combination of gears, shafts, etc., and because of its good assembly efficiency, it is possible to reduce manufacturing costs.In addition, because it is easy to maintain, it is expected that operating costs will also be reduced.

When a lawnmower is in operation, the power mechanism may suddenly stop due to grass or other objects getting caught in the working parts. If the power transmission mechanism is made up of gears and shafts as described above, the resulting shock or load may cause parts to break. However, the lawnmower of the present invention is able to absorb the shock caused by a sudden stop with the belt of the power mechanism, reducing the possibility of such breakdowns.

In this way, the grass cutter of the present invention has the above-mentioned configuration and the actions based on it, making it possible to use it conveniently by remote control, despite its relatively simple structure.

In addition, if the power mechanism unit further includes a fuel shortage detection unit and a cutoff unit that cuts off the power transmission from the engine to the first motor when the engine is stopped due to fuel shortage, and has a fuel shortage notification function that transmits detection information to the outside of the aircraft via the signal transmission/reception unit when the fuel shortage detection unit detects fuel shortage, and the cutoff unit is activated automatically or based on a signal from the outside of the aircraft after the fuel shortage notification, and has a function to drive the traveling means with the power stored in the battery when the power transmission is cut off by the cutoff unit, damage to the engine, etc. can be suppressed when the engine stops due to fuel shortage, and the operation can be switched to driving the traveling means with the power stored in the battery.

In more detail, when the grass cutter of the present invention detects that fuel is running out while it is in operation, the fuel-out detection unit detects that fuel is running out and transmits the detection information to the outside of the machine via the signal transmission/reception unit (fuel-out notification function). This allows the operator to directly or indirectly perceive that the grass cutter's engine has stopped due to fuel running out.

Furthermore, the aforementioned cutoff unit can be activated (automatically) or manually to cut off the transmission of power when the engine is stopped due to running out of fuel. This can prevent damage to the internal mechanism and damage to the first shaft and first pulley caused by forcibly moving an engine that has run out of fuel using power transmitted to the first shaft. Note that an example of the cutoff unit is a clutch provided midway along the first belt, etc., but other means are not excluded.

If the engine stops due to running out of fuel, the cutoff unit cuts off the transmission of power between the engine and the first motor, and the traveling means unit can be driven by the power stored in the battery. Note that examples of a power unit that is driven by power from the battery include the first motor described above, or another motor provided in addition to the first motor. This allows the grass cutter to be returned to the operator, even if the engine stops due to running out of fuel in a location far from the operator, without the operator having to go to retrieve the machine.

The device further includes a rotation speed measuring device that measures the engine rotation speed, and a load determination unit that compares the rotation speed measured by the rotation speed measuring device with preset rotation speed data to determine whether or not the current load is high. When the load determination unit determines that the current load is high, it transmits a signal notifying the control unit of the high load state. When the control unit receives the signal, and has a function of increasing the output of the first motor, the device can efficiently provide power assistance by the first motor in an overload state caused by a large amount of vegetation to be targeted during grass cutting work, etc.

In more detail, when an overload condition occurs, the engine speed drops, so the load determination unit compares the speed measured by the speed measurement device with preset speed data, and when it determines that the current load condition is high, a signal notifying the control unit of the high load condition is sent from the load determination unit to the control unit. The control unit then receives this signal and increases the output of the first motor, thereby providing power assistance from the first motor. In other words, there is no need to approach the lawnmower operating at a remote location to check whether or not it is overloaded, improving the operability and convenience of the machine when operated remotely.

The running performance of the grass cutter of the present invention is further improved if it further includes a second motor and a third motor that are driven by electric power directly received from the first motor or by electric power stored in a battery, and the running means unit is a track-type running structure having a drive wheel connected to the rotating shaft of the second motor as an axle and a drive wheel connected to the rotating shaft of the third motor as an axle, at least a pair of rollers, and a pair of tracks.

In more detail, the travel means has the aforementioned track-type travel structure, which improves travelling performance on rough roads and uneven ground, and also improves stability during work on slopes.

Furthermore, by using a motor to power the drive wheels, a complex mechanical structure is not necessary, allowing the aircraft to have a relatively simple structure; and, by using a track-type running structure and motors, changing direction can be achieved by simply rotating the second and third motors in the opposite direction, resulting in good maneuverability and maneuverability.

Furthermore, by using a motor to power the drive wheels, when the engine stops due to running out of fuel, the lawnmower can be driven directly by electricity from the first motor or can run on electricity stored in the battery, allowing the lawnmower to return to the operator.

In order to achieve the above object, the grass cutting device of the present invention is equipped with a grass cutter having a wireless controller, a signal transmission/reception unit for the controller, a control unit capable of controlling each unit of the machine body based on a signal received via the signal transmission/reception unit, a traveling means unit, a working unit that performs grass cutting, and a power mechanism unit capable of driving the working unit and the traveling means unit, the working unit and the power mechanism unit being provided on the machine body, the working unit and the power mechanism unit being provided on the machine body, the first motor including an engine including a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, a third shaft that rotates by receiving a driving force from the first motor, a fourth pulley provided on the third shaft, and a fourth pulley connected to the third shaft and transmitting power to the third shaft. The vehicle has a working unit having a grass-cutting knife unit driven by power transmitted from the battery, a first belt wound around the first pulley and the second pulley, and a second belt wound around the third pulley and the fourth pulley, and has a starting function in which the power of the first motor driven by the battery is transmitted to the first shaft via the first belt to rotate the first shaft, thereby starting the engine, a power generation and power storage function in which the power of the engine is transmitted to the second shaft via the first belt to constantly rotate the second shaft in an operating state other than a stopped state due to fuel shortage, thereby generating power by the first motor and storing the generated power in the battery, and a cutter drive function in which the working unit is driven by the power transmitted to the third shaft via the second belt.

The grass cutting device of the present invention is equipped with a wireless controller and a grass cutter having a signal transmission/reception unit with the controller described above, so that the grass cutting worker can remotely control the machine wirelessly to run the machine and cut grass without having to follow the machine. In addition, the possibility of the worker getting dirty in mud or getting injured during the work is greatly reduced, making the work easier and reducing the workload.

The grass trimmer has a signal transmitting/receiving unit, which allows it to receive wireless signals from the controller and transmit information about each part of the machine transmitted to the control unit as a signal to the outside of the machine. The transmitted signal may be sent to the controller for use in displaying machine information on a screen on the controller or turning on a warning lamp, or may be sent to a mobile information terminal such as a smartphone or tablet terminal or a personal computer (hereinafter referred to as a "PC") used by an operator or manager, or may be sent to both the controller and the mobile information terminal or PC, as long as the user such as the operator can perceive the content of the information.

The control unit can control each part of the aircraft based on the signal received via the signal transmission/reception unit. The parts of the aircraft include at least the traveling means unit, the working unit, and the power mechanism unit, but may also include other aircraft components.

In the power mechanism unit, when in an operating state except when the vehicle is stopped due to running out of fuel, the engine power is transmitted to the second shaft via a first belt that is wound around a first pulley and a second pulley, and electricity is generated by the first motor by constantly rotating the second shaft. The electricity generated by the first motor is then stored in the battery. The power mechanism unit then uses the electricity stored in the battery to drive the first motor, and the power of the first motor is transmitted to the first shaft via the first belt, causing the first shaft to rotate, thereby starting the engine.

In addition, because the power mechanism is configured as described above, the transmission of power is cut off when the engine stops due to running out of fuel, and damage to the internal mechanism and damage to the first shaft and first pulley caused by forcibly moving the engine that has run out of fuel by the power transmitted to the first shaft can be suppressed.

The power mechanism unit described above allows the driving means unit to be driven by the power of the first motor, which uses electricity stored in the battery, even if the engine has stopped due to running out of fuel in a location far from the operator, making it possible to return the grass cutter without the effort of going to retrieve the machine. In addition, if the design allows for ample capacity, such as by installing a large-capacity battery, it is also possible to continue mowing work to a certain extent before returning the grass cutter.

In the above-mentioned grass cutter, the engine power is transmitted via the second shaft provided with the third pulley, and is transmitted via the second belt to the working section provided with the fourth pulley, and the grass cutting knife section provided in the working section is driven by the power, enabling grass cutting work. In addition, according to the configuration of the working section and the power mechanism section described above, if an overload condition occurs due to the amount of grass to be cut, further power can be added from the first motor (power assist function).

Furthermore, since the power transmission mechanism of the working unit and power mechanism is a combination of pulleys and belts, it has a simple structure compared to power transmission mechanisms using gears, etc., and has good assembly efficiency and can reduce manufacturing costs. In addition, since it is easy to maintain, it is expected that operating costs will also be reduced. In addition, according to the configuration of the power mechanism, the belt can absorb the impact caused by a sudden stop, reducing the possibility of failures such as parts loss caused by impact or load. In addition, the traveling means unit is structured to be driven by power from the first motor, or is structured to be driven by electricity generated by the first motor and stored in the battery.

In this way, the grass cutting device of the present invention has the above-mentioned configuration and the action based on it, and while it has a relatively simple structure, it can be conveniently used by remote control.

In order to achieve the above object, the grass cutting method of the present invention uses a remote-controlled grass cutter equipped with a traveling means unit, a working unit that cuts grass, a power mechanism unit capable of driving the working unit and the traveling means unit, a signal transmission/reception unit with the outside of the machine, and a control unit capable of controlling each unit of the machine based on a signal received via the signal transmission/reception unit, and the power mechanism unit has an engine including a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a first motor including a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, and a first belt wound around the first pulley and the second pulley, and the first motor is driven by the battery, and the power of the first motor is transmitted to the first shaft via the first belt to rotate the first shaft. a power generation and storage process in which, in an operating state other than a stopped state due to fuel shortage, the power of the engine is transmitted to the second shaft via the first belt, and the second shaft is constantly rotated to generate power using the first motor and store the generated power in the battery; a movement process in which the power mechanism and the traveling means are driven via the control unit based on a signal from outside the machine received by the signal transmission/reception unit to move the machine to a predetermined position; and a grass cutting process in which the working unit has a grass cutting knife unit connected to a third shaft provided with a fourth pulley and a second belt wound around the third pulley and the fourth pulley, and the power of the engine is transmitted to the third shaft via the second belt and the fourth pulley to drive the grass cutting knife unit.

The grass cutting method of the present invention includes the above-mentioned starting process, which allows the engine to be started using the power of the first motor. Furthermore, a similar starting process can be carried out even in a machine that uses an engine that does not have a starter.

The grass cutting method of the present invention includes the above-mentioned power generation and power storage process, so that the first motor is driven by the engine's power to generate electricity, and the generated electricity can be stored in the battery.

Furthermore, by including the above-mentioned movement process, the grass cutting method of the present invention can receive a signal from outside the machine with the signal transmitting/receiving unit to control the control unit, which in turn drives the power mechanism unit and the traveling means unit to move the machine to a predetermined position (e.g., an area overgrown with vegetation). The traveling means unit is structured to be driven by power from the first motor, or is structured to be driven by electricity generated by the first motor and stored in a battery.

Furthermore, by including the above-mentioned grass cutting process, the grass cutting method of the present invention transmits the engine power to the working unit, which drives the grass cutting knife unit provided in the working unit to perform grass cutting work. Furthermore, according to the above-mentioned configuration of the working unit and power mechanism unit, if the load increases due to a large amount of target vegetation or the vegetation is hard, and an overload occurs, further power can be added from the first motor (power assist function).

And, in the grass-cutting method of the present invention, the grass-cutting work, including the above-mentioned starting process, power generation and storage process, movement process, and grass-cutting process, can be performed by remote control from outside the machine. Also, in the grass-cutting method of the present invention, the transmission of power is cut off when the engine is stopped due to running out of fuel, thereby suppressing damage to the internal mechanism and damage to the first shaft and first pulley caused by forcibly running the engine that has run out of fuel by the power transmitted to the first shaft.

Furthermore, in the grass cutting method of the present invention, even if the engine has stopped due to running out of fuel in a location far from the operator, the power mechanism unit described above can drive the traveling means unit using the electricity stored in the battery as power, allowing the grass cutter to return without the effort of going to retrieve the machine. Also, for example, if there is spare battery capacity, the grass cutter can be returned after continuing grass cutting work to a certain extent.

In addition, in the grass cutting method of the present invention, the power transmission mechanism of the remote-controlled grass cutter used is a combination of pulleys and belts, which has a simpler and lighter structure than a power transmission mechanism that uses a combination of gears, shafts, etc., and is easy to maintain, so operating costs can be expected to be reduced. Also, in the grass cutting method of the present invention, due to the structure of the power mechanism part described above (combination of pulleys and belts), it is possible to absorb the impact of a sudden stop of the power mechanism part due to vegetation or the like getting caught in the working part, thereby reducing the possibility of a breakdown.

In this way, the grass cutting method of the present invention has the above-mentioned configuration and the action based on it, and while it has a relatively simple structure, it can be suitably used by remote control.

In order to achieve the above object, the power mechanism of the present invention is provided in a remote-controlled working machine, and includes an engine having a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a first motor having a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, a third shaft that rotates by receiving a driving force from the first motor and a fourth pulley provided on the third shaft, and a working unit that performs work, a first belt wound around the first pulley and the second pulley, and a second pulley that is wound around the third pulley and the fourth pulley. and a second belt wound around the battery, the power of the first motor driven by the battery is transmitted to the first shaft via the first belt to rotate the first shaft, thereby starting the engine, and in an operating state other than a stopped state due to fuel shortage, the power of the engine is transmitted to the second shaft via the first belt to constantly rotate the second shaft, thereby generating electricity by the first motor and storing the generated electricity in the battery, and the structure is capable of driving the working unit with the power transmitted to the third shaft via the second belt.

The power mechanism is provided in a remote-controlled work machine, and in an operating state except when the machine is stopped due to running out of fuel, the power of the engine is transmitted to the second shaft via a first belt that is wound around a first pulley and a second pulley, and the second shaft is constantly rotated to generate power using the first motor. The power generated by the first motor is then stored in a battery. The power mechanism uses the power stored in the battery to drive the first motor, and the power of the first motor is transmitted to the first shaft via the first belt, causing the first shaft to rotate, thereby starting the engine.

The power mechanism has the above-mentioned configuration, which cuts off the transmission of power when the engine stops due to running out of fuel, and can also suppress damage to the internal mechanism and damage to the first shaft and first pulley caused by forcibly moving the engine that has run out of fuel using the power transmitted to the first shaft. Furthermore, with this power mechanism, even if the engine has stopped due to running out of fuel in a location far from the operator, the driving means of the remote-controlled work machine can be driven by the power of the first motor, which uses electricity stored in the battery, making it possible to return the machine without the effort of going to retrieve it.

The power mechanism unit described above transmits the engine power via the second shaft on which the third pulley is provided, and transmits it via the second belt to the working unit on which the fourth pulley is provided, and the power is used to drive a working part (e.g., a grass-cutting knife unit) provided on the working unit, thereby enabling a predetermined task (e.g., mowing, etc.). In addition, the power mechanism can further add power from the first motor (power assist function) when an overload condition occurs due to the work target (e.g., the amount of grass in grass-cutting work, etc.).

Furthermore, because the power transmission mechanism of the aforementioned power mechanism is a combination of pulleys and belts, it has a simpler structure than power transmission mechanisms using gears, etc., and has good assembly efficiency and can reduce manufacturing costs. In addition, it is easy to maintain, so it is expected that operating costs will also be reduced. In addition, because the configuration of this power mechanism allows the belt to absorb the impact of a sudden stop, it is possible to reduce the possibility of failures such as part loss caused by impact or load.

In this way, the power mechanism of the present invention, by providing the above-mentioned configuration and the action based thereon, can make a remote-controlled work machine equipped with the power mechanism suitable for remote control, while having a relatively simple structure.

The present invention provides a mower, a grass cutting device, a grass cutting method, and a power mechanism that are relatively simple in structure and can be suitably used by remote control.

1 is a diagram showing a configuration of a grass cutting device according to the present invention, which is composed of a grass cutter and a controller, as seen diagonally forward from the left. FIG. 2 is a perspective view of the grass cutter of FIG. 1, viewed obliquely from the front right. FIG. 2 is a perspective view of the grass cutter of FIG. 1, viewed obliquely from the right rear. FIG. 2 is a perspective view showing the grass cutter of FIG. 1 from below. 2 is a perspective view showing a main part of a power mechanism in the grass cutter of FIG. 1 . FIG. 6 is a rear view showing the power mechanism unit of FIG. 5 from the rear of the aircraft. 6 is a schematic diagram showing a power transmission structure of the power mechanism unit of FIG. 5 in a plan view. FIG. FIG. 2 is an explanatory side view showing the grass cutter of FIG. 1 in use when moved forward; 2 is an explanatory side view showing the grass cutter of FIG. 1 in use when moved backward; FIG.

The embodiment of the present invention will be described in more detail with reference to Figures 1 to 9. The reference numerals in each drawing are given to the extent that they reduce complexity and facilitate understanding, and in cases where multiple equivalent parts are given the same reference numeral, only some of them may be given the same reference numeral. Note that the reference numerals associated with the arrows shown in Figures 1 to 7 indicate directions for explanatory purposes, and with reference to the direction of the grass cutter shown in Figure 1, the reference numerals F and D respectively mean "forward", "backward", "rightward", "L" and "leftward", respectively.

[Grass cutting device 1]
The grass cutting device 1 will be described with reference to Figures 1 to 7. The grass cutting device 1 includes a grass cutter 2 and a wirelessly operated controller 3 (see Figure 1).

(Grass cutter 2)
The grass cutter 2 has a cowl 200, a frame 201, a traveling means unit 21, a power mechanism unit 22, a working unit 24, a signal transmitting/receiving unit 25, and a control unit 26. The power mechanism unit 22, the working unit 24, the signal transmitting/receiving unit 25, and the control unit 26 are directly or indirectly disposed on the frame 201. Each unit will be described in detail below.

(Cowl 200)
The cowl 200 is a removable box-shaped body that covers the top and all three sides of the power mechanism unit 22 and part of the working unit 24, and is made of a material having a predetermined rigidity and waterproof properties (see Figures 1 to 4).

(Frame 201)
The frame 201 is formed of a substantially flat rigid material (metal material in this embodiment) with both left and right ends bent downward, and has a stay 202, a stay 203, a skirt portion 204, and a skirt portion 205. The bent left and right portions are attachment portions for the traveling structures 21a and 21b (see FIGS. 1 to 6).

The stay 202 is erected on the frame 201 between the engine 221 and the first motor 222. The stay 203 is erected on the frame 201 between the engine 221 and the first motor 222 and the working unit 24 (see FIG. 5).

The skirt portion 204 is provided to protrude downwardly toward the front of the vehicle, has a width approximately equal to the width of the frame 201, and is provided so that its tip is higher than the underside of the track. The skirt portion 205 is provided to protrude downwardly toward the rear of the vehicle, has a width approximately equal to the width of the frame 201, and is provided so that its tip is higher than the underside of the track (see Figures 1 to 4).

(Traveling means unit 21)
The traveling means section 21 has a track-type traveling structure and is arranged on the left and right sides of the body with the frame 201 in between. When viewed from the front of the body as shown in Figure 1, the left side is the traveling structure section 21a and the right side is the traveling structure section 21b.

The running structure 21a has a pair of front and rear wheels 211 arranged on the ground side, sprockets 212a arranged above each wheel, and tracks 213 that are wrapped around the sprockets and the front and rear wheels. The sprockets 212a are connected to the rotating shaft of the second motor 223 as an axle (see Figures 2 and 3). The second motor 223 is driven by electricity supplied directly from the first motor 222 (described later) or by electricity stored in a battery 225.

The running structure 21b has a pair of front and rear wheels 211 arranged on the ground side, a drive wheel 212b arranged above the wheels, and tracks 213 that are wrapped around the drive wheels and the front and rear wheels. The drive wheel 212b is connected to the rotating shaft of the third motor 224 as an axle (see Figures 1 and 3). The third motor 224, like the second motor 223 described above, is driven by electricity from the first motor 222 or the battery 225 (see Figures 1 and 3).

(Power mechanism unit 22)
The power mechanism unit 22 has an engine 221, a first motor 222, a second motor 223, a third motor 224, a battery 225, a first pulley 226, a second pulley 227, a third pulley 228, a fourth pulley 229, a first belt 230, a second belt 231, a first clutch 232, and a second clutch 233 (see FIGS. 5 to 7). A detailed external description of the engine 221 will be omitted.

The engine 221 is disposed on the upper part of the frame 201 and on the front side of the aircraft, and has a recoil starter type engine body (reference numeral omitted), a rotating shaft capable of transmitting power to the outside (the first shaft described above), a connected fuel tank (not shown), and a revolution speed measuring device (not shown) (see Figs. 1-2). The fuel tank is connected to a fuel shortage detection unit (not shown). The revolution speed measuring device is connected to the engine and is connected so that its revolution speed can be measured. The aforementioned rotating shaft passes through a through hole (not shown) provided in the stay 203 and protrudes toward the rear of the aircraft, and a first pulley 226 is provided on the protruding part. In other words, the first pulley 226 is provided on the rear side of the aircraft, sandwiching the stay 203 (see Figs. 5-7).

The first motor 222 is disposed to the side of the engine 221 (in the width direction of the aircraft) across the stay 202, and has a rotating shaft (the second shaft described above) capable of transmitting power to the outside. The rotating shaft described above passes through a through hole (not shown) provided in the stay 203 and protrudes toward the rear of the aircraft, and the second pulley 226 and the third pulley 228 are provided on the protruding portion. In other words, the second pulley 226 and the third pulley 228 are provided on the rear of the aircraft across the stay 203 (see Figures 1, 5-7).

The second motor 223 is attached to the left side of the stay 202, and is connected to both the first motor 222 and the battery 225, and is driven by the supplied power. The second motor 223 has its rotating shaft connected as the axle of the drive wheel 212a (see FIG. 3).

The third motor 224 is attached to the right side of the stay 202, and is connected to both the first motor 222 and the battery 225, and is driven by the supplied power. The third motor 224 has its rotating shaft connected as the axle of the drive wheel 212b (see Figure 3).

The battery 225 is disposed at the rear of the aircraft and is electrically connected to the first motor 222, the second motor 223, the third motor 224, the signal transmitting/receiving unit 24, and the control unit 25 so as to be capable of supplying power to each of them (see FIG. 3).

The first belt 230 is looped around the first pulley 226 and the second pulley 227, and is arranged to be capable of transmitting power between the first pulley 226 and the second pulley 227. A first clutch 232 (the aforementioned cut-off unit) is arranged near the first belt 230, and the first clutch 232 is arranged to be capable of cutting off the power transmission between the engine 221 and the first motor 222 (see Figures 5 to 7).

The second belt 231 is looped around the third pulley 228 and a fourth pulley 229 (described later) and is arranged to allow power transmission between the third pulley 228 and the fourth pulley 229. A second clutch 233 is arranged near the second belt 231 and is arranged to be able to cut off the power transmission between the first motor 222 and the working unit 24 (see Figures 5 to 7).

(Working unit 24)
The working unit 24 has a gear box 242 having a rotating shaft arranged on the side (the third shaft mentioned above) and a rotating shaft arranged below, a fourth pulley 229 provided on the rotating shaft arranged on the side (the third shaft mentioned above), and a grass-cutting knife unit 241 (see Figures 5 to 7).

The gear box 242 is installed inside the casing, with a gear at the end of the horizontal rotating shaft meshing with a gear at the vertical rotating shaft to enable power transmission. Note that the gear may be, for example, a bevel gear, but this does not exclude other known technologies.

The downward rotating shaft of the gearbox 242 passes through a through hole (not shown) provided in the frame 201 and protrudes downward from the machine body, and the grass-cutting knife unit 241 is attached to the tip of the protruding part. In other words, the grass-cutting knife unit 241 is provided on the lower side of the machine body, sandwiching the frame 201 (see FIG. 6).

The grass-cutting knife section 241 has a cover section 243, a base section 244, and cutting blades 245a and 245b (see Figures 4 and 6).

The cover portion 243 is a cylindrical shape with a bottom that tapers from top to bottom, and is disposed between the frame 201 and the base portion 243. The cover portion 243 contains the downward-facing rotating shaft of the gear box 242 described above, and is arranged to be rotatable in the circumferential direction (see Figures 4 and 6).

The base 243 is an oval plate, and the downward rotating shaft of the gear box 242 described above is inserted into the intersection of its long and short axes. The base 243 is fixed near the intersection of its long and short axes and to the bottom of the cover part 243, and is provided so as to be rotatable together with the cover part 243 (see Figures 4 and 6).

Cutting blades 245a and 245b are removably attached to the edge of base 243 on the extension of the long axis. Cutting blade 245a is composed of a pair of upper and lower blades sandwiched between the plate surface of base 243, and cutting blade 245b is similar (see Figures 4 and 6).

(Signal Transmitter/Receiver 25)
The signal transmitting/receiving unit 25 is provided in an inner box (reference numeral omitted) covered by a cowl 200 (see FIG. 3 ). The signal transmitting/receiving unit 25 is electrically connected to the control unit 26 and is provided to be capable of transmitting operation signals received from outside the aircraft (such as the controller 3) to the control unit 26, and is provided to be capable of transmitting signals transmitted from the control unit 26 (for example, the state of each part of the aircraft) to outside the aircraft (such as the controller 3).

(Control unit 26)
The control unit 26 is provided in an inner box (reference numeral omitted) like the signal transmitting/receiving unit 25, and is composed of a transmitting/receiving unit for the signal transmitting/receiving unit 25, a calculation unit, a control unit, an input unit, an output unit, a main memory unit, a load determining unit, etc. The load determining unit has a function of comparing the rotation speed of the engine 221 measured by the above-mentioned rotation speed measuring device with preset rotation speed data to determine whether or not the current load state is high, and a function of transmitting a signal notifying the high load state to the control unit when it is determined that the current load state is high, and the control unit receiving the signal increases the output of the first motor 222 (see FIG. 3).

In this embodiment, the controller 3 is of a wireless operation type that allows remote control by wireless, but this is not limited to this, and as mentioned above, it may be of a wired type, or may be operated by a mobile information terminal such as a smartphone or tablet terminal or a personal computer used by a worker or manager.

In this embodiment, the cowl 200 covers the working unit 24 and part of the power mechanism unit 23, but is not limited to this and various modifications are possible, including, for example, covering all of the power mechanism units such as the engine and motor, and all of the components arranged on the frame such as the signal transmission/reception unit and control unit.

In this embodiment, the frame 201 has the shape and structure described above, but is not limited to this. For example, the shape and structure of the frame may be different, or the stays, front and rear skirt portions, or multiple members may not be provided.

In this embodiment, the traveling means unit 21 is a track-type traveling structure, but is not limited to this and may be a structure having independent traveling wheels, such as four or six wheels.

In this embodiment, the power mechanism unit 22 uses a belt as the power transmission means, but this does not exclude the use of a chain as an alternative. Also, the second pulley and the third pulley are described as separate parts, but they may be an integrated structure. Furthermore, the drive wheel 212a is driven by the second motor 223, and the drive wheel 212b is driven by the third motor 224, but this is not limited to the structure, and for example, each drive wheel may be driven using a pulley or a drive shaft. In this case, the battery may be electrically connected to the first motor, the signal transmission/reception unit, and the control unit, and be capable of supplying power to each of them.

In this embodiment, the working unit 24 has the above-mentioned configuration, but is not limited to this and can be modified as appropriate. For example, a worm gear or belt drive can be used as the power transmission mechanism between the horizontal and vertical rotating shafts in the gear box. In addition, the grass-cutting knife unit can have a structure without a cover, or the base can have a rectangular shape, or the number and position of the cutting blades arranged can be different, or the cutting blades can be arranged not in pairs in the vertical direction.

In this embodiment, the signal transmission/reception unit 25 and the control unit 26 have the configuration described above, but are not limited to this. For example, they may have a transmission function that allows them to transmit and receive data to and from external terminals other than the controller 3.

(Function of the grass cutter 1 and a grass cutting method using the same)
The operation and effect of each part of the mower 1 and a method of mowing using the mower 1 will be described with reference to Figs.

In the grass trimmer 1, the frame 201, having the above-mentioned structure, serves as the mounting base for each part of the machine, and the stay 202 separates the engine 221 and the first motor 222, preventing waste heat or emissions (e.g. oil leaking from the engine) from either or both of the parts that may occur after the machine is started from affecting the other.

In the grass cutter 1, the stay 203 serves as a base for mounting the first pulley 226, the second pulley 227, and the third pulley 228, the first belt 230, the second belt 231, the first clutch 232, and the second clutch 233, and constitutes part of the power mechanism 23. In addition, the stay 203 serves as a partition plate by positioning part of the power mechanism 23, such as the pulleys, on the opposite side of the engine 221 and the first motor 222, thereby preventing the pulleys from being affected by waste heat and emissions from the engine 221, etc., without the need for a cover or the like.

<Start-up process>
The grass cutter 1 is started by a signal from the controller 3. More specifically, starting the first motor 222 rotates the second pulley 227, and power is transmitted to the first pulley 226 via the first belt 230 wound around the second pulley 227. The rotating shaft on which the first pulley 226 is provided is the crankshaft of the engine, and as this rotates (similar to a so-called push-starting of the engine), the engine 221 starts.

In other words, even if the engine 221 is not equipped with a starter, the same starting process can be performed as for an engine equipped with a starter. When the battery 225 is in a fully discharged state, the engine 221 can also be started by pulling the recoil starter.

<Power generation and storage process>
During normal operation of the grass cutter 1 with the engine 221 started, the first pulley 226 rotates with the power of the engine 221, the second pulley rotates via the first belt 230 wound around the first pulley 226, and the first motor 222 is driven. In other words, during normal operation of the grass cutter 1, the first motor 222 is driven with the power of the engine 221 to generate electricity at all times, and the generated electricity is stored in the battery 225.

The electricity stored in the battery 225 is supplied to various parts, such as the first motor 222, the second motor 223, the third motor 224, the clutch motors (not shown) that drive the first clutch 232 and the second clutch 233, the fuel shortage detection unit (not shown), the signal transmission/reception unit 25, the control unit 26, etc., and serves as the power source for the next engine start and aircraft operation.

<Transfer process>
Once the lawnmower 1 is started, it receives a signal from the controller 3 (i.e. a signal from outside the machine) via the signal transmission/reception unit 25 and transmits it to the control unit 26, and drives the power mechanism unit 22 and the running means unit 21 under the control of the control unit 26, thereby moving the machine to a designated position, such as a work area overgrown with vegetation.

By having the cowl 200 of the above-described structure, the grass cutter 1 can protect the working section 24 and the power mechanism section 23 from causes of breakdown, such as being covered with rain or mud, or being engulfed in debris such as cut vegetation and its fragments, during transportation, standby, operation, or storage.

The running means unit 21 has good running performance on rough roads and uneven ground, and also has good stability during work on slopes, because the running structure units 21a and 21b are the track-type running structure described above. In addition, because the drive wheels 212a and 212b are powered by motors (the second motor 223 and the third motor 224), a complex mechanical structure is not required, and the structure of the machine body can be made relatively simple.

When changing direction, the traveling means unit 21 can quickly turn on the spot by simply rotating the second motor 223 and the third motor 224 in the opposite direction to move each track 213 in the opposite direction, making it highly maneuverable and easy to operate.

When the fuel-out detection unit (not shown) detects that fuel is about to run out or that the engine has stopped due to fuel out while moving or working, it transmits detection information to the outside of the machine via the signal transmission/reception unit 25 (fuel-out notification function), allowing the operator to know the status of the grass cutter 1 directly or indirectly. After the fuel-out notification, before or after the engine 221 stops, the first clutch 232 is automatically started, or the first clutch 232 is started based on a signal from outside the machine such as the controller 3 (see FIG. 6. Note that "starting the first clutch 232" is used here to mean starting the first clutch in the disconnecting direction to cut off the power transmission).

When the vehicle runs out of fuel, the first clutch 232 cuts off the transmission of power between the engine 221 and the first motor 222, and the driving means unit 21 can be driven by the power of the first motor 221, the second motor 223, and the third motor 224, which use electricity from the battery 25.

As a result, even if the engine 221 stops due to running out of fuel in a location far from the operator, the operation can be switched to running the machine using the power stored in the battery 25, and the grass cutter 1 can be returned to the operator without the effort of going to retrieve the machine.

In addition, by activating the first clutch 232 when the engine 221 stops due to running out of fuel, damage to the internal mechanism caused by forcibly moving the engine 221 that has run out of fuel using the power transmitted to the engine's rotating shaft (the first shaft described above) and damage to the rotating shaft and the first pulley 226 can be suppressed.

<Grass cutting process>
When the grass cutter 1 is driven to a work site, the skirt portion 204 having the above-described structure can push down the object W1 to be cut in substantially the same direction (toward the traveling direction of the machine body). At this time, the object W1 to be cut is bent at a uniform height near the base due to the gap between the tip of the skirt portion 204 and the ground. As a result, when the grass cutter knife portion 241 cuts the object W1 to be cut next, the direction of the object W1 to fall and the cutting height are substantially the same, so that uneven cutting in the planar direction in the work site is unlikely to occur, and unevenness in the height direction of the object W2 after cutting is unlikely to occur (in other words, the cutting height of the object W2 after cutting is likely to be uniform), which improves work efficiency and contributes to improving the aesthetic appearance of the work site after work (see FIG. 8).

In addition, the skirt portion 205 of the above-described structure exerts the same effect as the skirt portion 204 when the mower 1 is driven in reverse or turned around on the work site, reducing the occurrence of uneven cutting of the object to be cut W1 and uneven cutting height of the object to be cut W2 after cutting, improving work efficiency and contributing to improving the appearance of the work site after work (see Figure 9).

The grass cutter 1 performs grass cutting work using the grass cutting knife unit 241 that rotates under the machine body. The power of the engine 221 is transmitted to the grass cutting knife unit 241 via the third pulley 228, the second belt 231, the fourth pulley 229, and the gear box 242, and the cover unit 243 and the base unit 244 rotate. As a result, the cutting blades 245a, 245b provided on the base unit 244 cut the cutting object W1.

When the grass cutter 1 is moving toward the work site, the second clutch 233 is activated in the disengagement direction to prevent the grass cutting knife unit 241 from spinning freely. Then, when the grass cutter 1 approaches or reaches the work site, the second clutch 233 is activated in the engagement direction to enable power transmission (the clutch is engaged), and the grass cutting knife unit 241 is rotated.

The grass-cutting knife section 241 has a structure that includes a cover section 243 that can rotate in the circumferential direction during rotation, and a base section 243 fixed to the bottom of the cover section 243, which prevents the cutting object W1 from wrapping around and becoming entangled around the rotating shaft that rotates the base section 243 before and after cutting.

The lawnmower 1 also uses a rotation speed measuring device and a load determining unit that cooperates with it to compare the measured engine 221 rotation speed with preset rotation speed data to determine whether or not the current load is high. If an overload condition occurs due to a large amount of harvested objects W1 or other reasons, the lawnmower 1 determines that the engine 221 is in a high load state and sends a signal notifying the high load state to the control device of the control unit 26. The control device that receives this signal increases the output of the first motor 222 (in other words, power assistance is provided by the first motor).

In other words, there is no need to approach the mower 1 operating at a remote location to check whether it is overloaded, and the machine is easy to operate and convenient to use when operated remotely. Even if the power mechanism unit 22 suddenly stops due to the mowing object W1 getting caught in the grass cutting knife unit 241, which is the working unit 24, the shock can be absorbed because it is a combination of pulleys and belts, reducing the possibility of a breakdown.

Even if the engine of the grass cutter 1 has stopped due to running out of fuel, if there is enough remaining battery power to allow the grass cutter 1 to return home, the power transmission between the engine 221 and the first motor 222 can be cut off by the first clutch 232, while the power transmission between the first motor 222 and the gear box 242 can be connected, so that the grass cutter 1 can continue to mow for a certain amount of time before returning home.

In this way, the operation of the grass cutter 1 and the grass cutting method using it provide the effects based on the configuration described above, and while it has a relatively simple structure, it can be conveniently used by remote control.

The terms and expressions used in this specification and claims are merely explanatory and are not limiting in any way, and are not intended to exclude terms and expressions equivalent to the features described in this specification and claims or parts thereof. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention. Furthermore, the words "first," "second," etc. do not mean rank or importance, but are used to distinguish one element from another element.

REFERENCE SIGNS LIST 1 Grass cutting device 2 Grass cutter 200 Cowl 201 Frame 202 Stay 203 Stay 204 Skirt section 205 Skirt section 21 Traveling means section 21a, 21b Traveling structure section 211 Roller wheels 212a, 212b Driving wheel 213 Track 22 Power mechanism section 221 Engine 222 First motor 223 Second motor 224 Third motor 225 Battery 226 First pulley 227 Second pulley 228 Third pulley 229 Fourth pulley 230 First belt 231 Second belt 232 First clutch 233 Second clutch 24 Working section 241 Grass cutting knife section 242 Gear box 243 Cover section 244 Base section 245a, 245b Cutting blade 25 Signal transmitting/receiving unit 26 Control unit 3 Controller W1 Harvesting object W2 Post-harvesting object

Claims (7)

The machine includes a traveling means unit, a working unit that cuts grass, a power mechanism unit that can drive the working unit and the traveling means unit, a signal transmission/reception unit with the outside of the machine, and a control unit that can control each unit of the machine based on a signal received via the signal transmission/reception unit,
The working unit and the power mechanism unit include an engine including a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a first motor including a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, a third shaft that receives a driving force from the first motor and rotates, a fourth pulley provided on the third shaft, and a working unit having a grass-cutting knife unit that is connected to the third shaft and driven by the power transmitted to the third shaft, a first belt wound around the first pulley and the second pulley, and a second pulley and a third pulley. a second belt wound around the first shaft and a second belt wound around the third shaft, the brush cutter having a starting function in which power of the first motor driven by the battery is transmitted to the first shaft via the first belt to rotate the first shaft, thereby starting the engine, a power generation and power storage function in which power of the engine is transmitted to the second shaft via the first belt to constantly rotate the second shaft in an operating state except for a stopped state due to running out of fuel, thereby generating power by the first motor and storing the generated power in the battery, and a cutter drive function in which power transmitted to the third shaft via the second belt drives the working unit. the power mechanism unit further includes a fuel shortage detection unit and a cut-off unit that cuts off power transmission from the engine to the first motor when the engine is stopped due to a fuel shortage,
2. The grass mower according to claim 1, further comprising a fuel-out notification function that transmits detection information to outside the machine via the signal transmitting/receiving unit when the fuel-out detection unit detects that the fuel is out, and a function that activates a cut-off unit automatically or based on a signal from outside the machine after the fuel-out notification, and drives the traveling means with the power stored in the battery when the power transmission is cut off by the cut-off unit. a rotation speed measuring device that measures the engine speed, and a load determining unit that compares the engine speed measured by the rotation speed measuring device with preset engine speed data to determine whether or not the engine is currently in a high load state,
3. The grass mower according to claim 1, wherein the load determination unit transmits a signal to the control unit notifying the control unit of a high-load state when the load determination unit determines that the high-load state exists, and the control unit, upon receiving the signal, has a function of increasing an output of the first motor. The vehicle further includes a second motor and a third motor that are driven by directly receiving electric power from the first motor or by electric power stored in the battery,
4. The grass mower according to claim 1, wherein the traveling means unit is a track-type traveling structure having a drive wheel connected to a rotating shaft of the second motor as an axle, a drive wheel connected to a rotating shaft of the third motor as an axle, at least a pair of rollers, and a pair of tracks. A wireless controller and
a grass cutter having a signal transmission/reception unit with the controller, a control unit capable of controlling each unit of the machine body based on a signal received via the signal transmission/reception unit, a traveling means unit, a working unit that cuts grass, and a power mechanism unit capable of driving the working unit and the traveling means unit,
The working unit and the power mechanism unit include an engine including a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a first motor including a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, a third shaft that receives a driving force from the first motor and rotates, a fourth pulley provided on the third shaft, and a working unit having a grass-cutting knife unit that is connected to the third shaft and driven by the power transmitted to the third shaft, a first belt wound around the first pulley and the second pulley, and a second pulley and a third pulley. a second belt wound around the first shaft and a second belt wound around the third shaft, the brush cutting device having a starting function in which power of the first motor driven by the battery is transmitted to the first shaft via the first belt to rotate the first shaft, thereby starting the engine, a power generation and power storage function in which power of the engine is transmitted to the second shaft via the first belt to constantly rotate the second shaft in an operating state except for a stopped state due to running out of fuel, thereby generating power by the first motor and storing the generated power in the battery, and a cutter drive function in which the power transmitted to the third shaft via the second belt drives the working unit. A remote-controlled grass cutter is used, the remote-controlled grass cutter being provided with a traveling means unit, a working unit for mowing grass, a power mechanism unit capable of driving the working unit and the traveling means unit, a signal transmission/reception unit for transmitting and receiving signals to and from the outside of the machine, and a control unit capable of controlling each unit of the machine based on a signal received via the signal transmission/reception unit,
a starting process in which the power mechanism unit has an engine including a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a first motor including a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, and a first belt wound around the first pulley and the second pulley, and the first motor is driven by the battery, and the power of the first motor is transmitted to the first shaft via the first belt to rotate the first shaft, thereby starting the engine;
a power generation and storage process for transmitting power of the engine to the second shaft via the first belt and constantly rotating the second shaft in an operating state other than a stopped state due to a fuel shortage, thereby generating power by the first motor and storing the generated power in the battery;
a moving step of moving the machine to a predetermined position by the power mechanism unit and the traveling means unit, which are driven via the control unit based on a signal from outside the machine and received by the signal transmitting/receiving unit;
The working unit has a grass-cutting knife unit connected to a third shaft provided with a fourth pulley, and a second belt looped around the third pulley and the fourth pulley, and the power of the engine is transmitted to the third shaft via the second belt and the fourth pulley to drive the grass-cutting knife unit. Provided on a remote-controlled work machine,
the engine having a first shaft capable of transmitting power to the outside and a first pulley provided on the first shaft, a first motor having a second shaft capable of transmitting power to the outside and a second pulley and a third pulley provided on the second shaft, a battery electrically connected to the first motor, a third shaft that rotates by receiving a driving force from the first motor and a fourth pulley provided on the third shaft, a working unit that performs work, a first belt that is wound around the first pulley and the second pulley, and a second belt that is wound around the third pulley and the fourth pulley,
A power mechanism in which the power of the first motor driven by the battery is transmitted to the first shaft via the first belt to rotate the first shaft, thereby enabling the engine to be started, and in an operating state except for a stopped state due to running out of fuel, the power of the engine is transmitted to the second shaft via the first belt to constantly rotate the second shaft, thereby enabling the first motor to generate power and the generated power to be stored in the battery, and the working unit can be driven by the power transmitted to the third shaft via the second belt.

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