JP2531381Y2 - Electric mower - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric mower equipped with a cutting blade driven by an electric motor.

[0002]

2. Description of the Related Art Conventionally, the structure of this type of electric mower is generally shown in FIG. First, a case 2 is fixed to one end of a cylindrical connecting rod 1.
Inside the electric motor 5 fixed by the positioning parts 3 and 4
Is stored. Further, a small gear 7 fixed to the motor shaft 6 of the electric motor 5 and a large gear 9 fixed to the cutting blade shaft 8 are accommodated in the case 2. The gear 9 is engaged. The cutting blade shaft 8 is rotatably supported by bearings 10 and 11 and has a lower end protruding out of the case 2. A tip of the cutting blade shaft 8 protruding out of the case 2 has a holder 12. A disk-shaped cutting blade 14 is fastened and fixed to the holder 12 by a nut 13.

At the other end of the connecting rod 1, a handle (not shown) for operating the electric mower and a power supply (not shown) for driving the electric motor 5 are mounted. Terminals 15 and 16 of the electric motor 5
Electric wires 17 and 18 for connecting the power supply device and the power supply device are disposed inside the connecting rod 1.

The motor case 19 of the electric motor 5 has a plurality of windows 20 for cooling the electric motor 5 by natural convection.

[0005]

The case 2 is disposed at a position close to the cutting blade 14, and the case 2 is provided to prevent dust, grass, and the like sowing during the mowing operation from entering the case 2. Sealed. For this reason, the cooling of the electric motor 5 is performed by natural convection in the case 2 and heat conduction to the case 2, but sufficient cooling cannot be expected.
There is a danger of an accident that the motor coil and the like of the electric motor 5 are burned out due to overheating. Further, even if the motor coil and the like do not burn out, there is a disadvantage that the life is shortened due to repeated overheating.

[0006]

According to the present invention, a case accommodating an electric motor for driving a cutting blade is fixed to one end of a cylindrical connecting rod, and the electric motor is connected to the other end of the connecting rod. An electric mowing machine equipped with a power supply device for driving the motor, wherein a cooling fan is provided inside a motor case of the electric motor, and a suction port for sucking cooling air into the motor case and a discharge port for discharging the sucked cooling air. Are formed in the motor case, and a partition wall is provided for partitioning the inside of the case into a cooling air suction space communicating with the suction port and a cooling air discharge space communicating with the discharge port. A cooling air inlet communicating with the cooling rod is provided at the other end of the connecting rod or a gap between the cutting blade and the case, and the cooling air discharge space communicates with the atmosphere. The outlet is formed in the case.

According to a second aspect of the present invention, in the first aspect, a cooling air discharge passage communicating the cooling air discharge space and the cooling air discharge port is formed in the case, and the cutting blade is fixed to the cutting blade. Blades which rotate integrally with the shaft were provided, and the blades were arranged facing the cooling air discharge passage.

[0008]

According to the first aspect of the present invention, when the cooling fan rotates with the driving of the electric motor, cooling air is taken in from the cooling air inlet, and the cooling air is drawn into the cooling air suction space and sucked. It is sucked into the motor case from the outlet, and further discharged from the discharge port into the cooling air protruding space, and then discharged into the atmosphere from the cooling air discharge port.The electric motor is cooled in the course of this series of cooling air flows. You.

According to the present invention, the flow of the cooling air flowing from the cooling air discharge space to the cooling air discharge port through the cooling air discharge passage is promoted by the rotation of the blade, and the amount of the cooling air taken into the case is reduced. Increase.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. Note that the same parts as those described in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. A case 21 is fixed to one end of the cylindrical connecting rod 1, and an electric motor 2 fixed by positioning portions 22 and 23 in the case 21.
4 are stored. Further, a small gear 7 fixed to the motor shaft 6 of the electric motor 24 and a large gear 9 fixed to the cutting blade shaft 8 are housed in the case 21. A holder 12 is press-fitted and fixed to the tip of the cutting blade shaft 8 protruding out of the case 21, and a disk-shaped cutting blade 14 is fastened and fixed to the holder 12 by a nut 13.

A cooling fan 2 fixed to the upper end of the motor shaft 6 is provided in a motor case 25 of the electric motor 24.
The motor case 25 has a plurality of suction ports 27 for sucking cooling air into the motor case 25, and the motor case 25
A plurality of discharge ports 28 for discharging to the outside are formed.

A partition wall for partitioning the inside of the case 21 into a cooling air suction space 29 communicating with the suction port 27 and a cooling air discharge space 30 communicating with the discharge port 28. 31, 32, and 33 are provided.

At the other end of the connecting rod 1, there is formed a cooling air inlet (not shown) for communicating the cooling air suction space 29 with the atmosphere via the internal space of the connecting rod 1. . The case 21 has a cooling air discharge port 34 opened to the atmosphere, and a cooling air discharge passage 35 communicating the cooling air discharge port 34 with the cooling air discharge space 30.

A handle (not shown) for operating the electric mower and a power supply (not shown) for driving the electric motor 24 are attached to the other end of the connecting rod 1. , Terminal 1 of the electric motor 24
Electric wires 17, 1 for connecting the power supply device to the power supply devices 5, 16
8 is arranged inside the connecting rod 1.

In such a configuration, when the power supply device is turned on to perform the mowing operation by the cutting blade 14,
The driving of the electric motor 24 drives the cutting blade 14 to rotate together with the cutting blade shaft 8, and also drives the cooling fan 26 to rotate.

When the cooling fan 26 is driven to rotate, cooling air is taken in from the cooling air inlet, and this cooling air is drawn into the cooling air suction space 29 through the inside of the connecting rod 1 and further drawn into the suction port. 27 is drawn into the motor case 25. The cooling air drawn into the motor case 25 is discharged from the discharge port 28 into the cooling air discharge space 30, and further discharged through the cooling air discharge passage 35 to the atmosphere from the cooling air discharge port 34. Then, the electric motor 24 is cooled in the course of the flow of the cooling air, and the occurrence of burnout accident of the motor coil or the like due to overheating is prevented.

Further, since the cooling air inlet is located at a position away from the cutting blade 14, dust and grass sowed up during mowing can be prevented from entering the case 21.

Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the same parts as those described in FIG. An electric motor 24 having a cooling fan 26 therein is housed in the case 21, and the inside of the case 21 is partitioned by cooling air intake spaces 2 by partition walls 31, 32, and 33.
9 and a cooling air discharge space 30. Further, a cooling air inlet 36 is formed in a gap between the case 21 and the cutting blade 14 for communicating the cooling air suction space 29 with the atmosphere.

In such a configuration, the electric motor 24
When the cooling fan 26 is driven to rotate in accordance with the driving of the motor case 2, cooling air is taken in from the cooling air inlet 36, and the cooling air is supplied from the cooling air suction space 29 to the motor case 2.
The cooling air is discharged into the air through the cooling air discharge space 30 and the cooling air discharge passage 35 and then into the atmosphere.

Here, the cooling air is taken in from the cooling air inlet 36 disposed at a position close to the cutting blade 14, but dust and grass near the cutting blade 14 are rotated by the rotation of the cutting blade 14. Due to the centrifugal force involved, the blade 21 is blown out of the cutting blade 14, so that dust and grass can be prevented from entering the case 21 from the cooling air inlet 36.

Next, a third embodiment of the present invention will be described with reference to FIG. The case 21 has a cooling air discharge port 37 opened to the atmosphere, and the cooling air discharge passage 3 communicating the cooling air discharge port 37 with the cooling air discharge space 30.
8 are formed. A plurality of blades 39 are fixed to the holder 12 press-fitted and fixed to the cutting blade shaft 8, and these blades 39 are arranged facing the cooling air discharge port 37 and the cooling air discharge passage 38. ing.

In such a configuration, the electric motor 24
The cooling fan 26 is driven to rotate in accordance with the drive, and the blade 39 is further driven to rotate together with the holder 12 and the cutting blade 14. When the cooling fan 26 is driven to rotate, the cooling air taken in from the cooling air inlet reaches the cooling air suction space 29, and after passing through the motor case 25, the cooling air is discharged. The air is discharged from the cooling air discharge port 37 to the atmosphere via the space 30 and the cooling air discharge passage 38, and the electric motor 24 is cooled by the cooling air. Further, the blades 3 face the cooling air discharge port 37 and the cooling air discharge passage 38.
When the blade 39 is driven to rotate, the discharge of the cooling air from the cooling air discharge port 37 is promoted, and therefore, the amount of the cooling air sucked into the case 21 increases. The cooling performance of the electric motor 24 is improved.

[0023]

According to the first aspect of the present invention, a case accommodating an electric motor for driving a cutting blade is fixed to one end of a cylindrical connecting rod, and a cooling fan is provided in a motor case of the electric motor. In addition, a suction port for sucking the cooling air into the motor case and a discharge port for discharging the sucked cooling air are formed in the motor case, and further, the inside of the case communicates with the cooling air suction space and the discharge port communicating with the suction port. A partition wall is provided for separating the cooling air discharge space from the cooling air discharge space, a cooling air intake port is provided for communicating the cooling air suction space with the atmosphere, and a cooling air discharge port communicating the cooling air discharge space to the atmosphere is formed in the case. When the cooling fan rotates with the drive of the electric motor, cooling air is taken into the case from the cooling air inlet, and the cooling air is supplied to the cooling air intake space. To be released into the atmosphere from the motor case, the cooling air outlet through the cooling air discharge space,
The electric motor can be cooled in the course of the flow of the cooling air, and therefore, it is possible to prevent a motor coil from being burned out due to overheating of the electric motor and to improve the durability of the electric motor. In addition, the cooling air inlet provided at the other end of the connecting rod or the gap between the cutting blade and the case causes the cooling air intake provided at the other end of the connecting rod to be generated during mowing work. The case is located away from the soaring dust and grass, and the dust and grass are blown off by the centrifugal force of the cutting blade at the cooling air intake provided in the gap between the cutting blade and the case. It can prevent dust and grass from entering inside,
Further, as in the invention according to claim 2, a cooling air discharge passage communicating the cooling air discharge space and the cooling air discharge port is formed in the case, and the cutting blade rotates integrally with the fixed cutting blade shaft. By arranging the blades facing the cooling air discharge passage, the rotation of the blades can promote the flow of the cooling air discharged from the cooling air discharge port through the cooling air discharge passage. It is possible to increase the amount of cooling air taken into the motor and to cool the electric motor more effectively.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional front view showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional front view showing a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connecting rod 14 Cutting blade 21 Case 24 Electric motor 25 Motor case 26 Cooling fan 27 Suction port 28 Discharge port 29 Cooling air suction space 30 Cooling air discharge space 31, 32, 33 Partition wall 34, 37 Cooling air discharge port 36 Cooling air Inlet 38 Cooling air discharge passage 39 Blade

Claims (2)

(57) [Scope of request for utility model registration] 1. An electric mowing machine comprising: a case in which an electric motor for driving a mowing blade is housed; and a power supply for driving the electric motor mounted on the other end of the connecting rod. In the motor case, a cooling fan is provided in a motor case of the electric motor, and a suction port for sucking cooling air into the motor case and a discharge port for discharging the sucked cooling air are formed in the motor case. A partition wall for partitioning a cooling air suction space communicating with the suction port and a cooling air discharge space communicating with the discharge port, and connecting the cooling air inlet communicating the cooling air suction space with the atmosphere with the connecting rod. The cooling air discharge port is provided in the other end or in the gap between the cutting blade and the case, and the cooling air discharge space communicating with the atmosphere is formed in the case. And electric mower. 2. A cooling air discharge passage communicating with a cooling air discharge space and a cooling air discharge port is formed in a case, and a blade that rotates integrally with a cutting blade shaft to which a cutting blade is fixed is provided. The electric mower according to claim 1, wherein the electric mower is disposed so as to face the cooling air discharge passage.