JP7392553B2 - work equipment - Google Patents

Description

The present invention relates to a working machine having a circuit board within a housing.

Patent Document 1 below relates to a power tool such as a grinder. The housing of this power tool includes a motor housing that accommodates a brushless motor, and a rear cover attached to the rear of the motor housing. A container-shaped case is provided inside the rear cover, and a circuit board is arranged inside the case. The circuit board is equipped with a calculation unit that controls the rotation of the motor, an inverter circuit that drives the motor, and a power supply circuit that converts alternating current supplied via a power cord from the outside into direct current. Ru. The entire circuit board is hardened within the case with a curable resin that hardens liquid resin.

Patent No. 6443541

BACKGROUND OF THE INVENTION From the viewpoint of convenience, there is still a demand for downsizing of work machines that can be held in the hand or transported.

The present invention was made in recognition of this situation, and its purpose is to provide a work machine that can be downsized.

An embodiment of the present invention is a working machine. This work machine is
A working machine having a housing that accommodates a motor,
The housing includes a motor case that accommodates the motor, a container-like container portion connected to the motor case, and a holding portion that holds a power supply portion that supplies power to the motor,
A portion of the container portion forms an outer shell of the housing ,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit ,
One end of the container part is connected to the motor case, and the other end of the container part is connected to the holding part in the extending direction of the circuit board .

The power supply section may be a power cord, and the holding section may support a cord armor that protects the power cord.

The housing accommodates a fan rotated by the motor, and is provided with a wind window for generating cooling air within the housing by rotation of the fan,
The control circuit may be cooled by the cooling air .

Another aspect of the invention is a working machine. This work machine is
a housing that accommodates the motor;
a fan rotated by the motor;
The housing includes a motor case accommodating the motor, and a container portion connected to the motor case,
A portion of the container portion forms an outer shell of the housing,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit,
The housing includes a holding part that is a separate member from the container part and holds a power supply part that supplies power to the motor,
A wind window for generating cooling air in the housing by rotation of the fan is provided in the holding part , and the control circuit is cooled by the cooling air .

Another aspect of the invention is a working machine. This work machine is
a housing that accommodates the motor;
a fan rotated by the motor;
The housing includes a motor case that accommodates the motor, a container-shaped container portion connected to the motor case, and a cover portion configured as a separate member from the container portion and covering the container portion. ,
A portion of each of the container portion and the cover portion constitutes an outer shell of the housing,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit,
The cover portion is provided with a wind window for generating cooling air within the housing by rotation of the fan , and the control circuit is cooled by the cooling air .

The container portion may be opened in a predetermined direction, and the predetermined direction side may be covered by the cover portion.

A heating element or a heat radiating member, at least a portion of which is exposed through the opening of the container portion, may be located on a side of the circuit board in a predetermined direction, and may be cooled by the cooling air.

Another aspect of the invention is a working machine. This work machine is
A working machine having a housing that accommodates a motor,
The housing includes a motor case accommodating the motor, and a container portion connected to the motor case,
A portion of the container portion forms an outer shell of the housing,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit,
one end of the container part is connected to the motor case by a fastener,
The container portion has a slit that exposes the fastener,
A cover part that fills the slit is attached to the container part.

The motor has a rotor that rotates with the front-rear direction as an axis,
The housing has a gear case that is connected to the front side of the motor case and holds a spindle to which a tip tool is fixed.
The container portion and the cover portion may be located at the rear of the motor case and may form part of an outer shell of the housing, which has a substantially cylindrical shape.

Note that arbitrary combinations of the above components and expressions of the present invention converted between methods, systems, etc. are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a work machine that can be downsized.

FIG. 1 is a perspective view of a working machine 1 according to Embodiment 1 of the present invention. FIG. 2 is a side view of the working machine 1. FIG. 2 is a plan view of the working machine 1. IV-IV sectional view of FIG. 2. V-V sectional view of FIG. 3. An enlarged view of the VI section in FIG. 5. VII-VII sectional view in Figure 3. FIG. 3 is a view of the container section 10 of the working machine 1 and its internal configuration as viewed from below. FIG. 2 is an exploded perspective view of the working machine 1 seen from the front and above. FIG. 2 is an exploded perspective view of the working machine 1 seen from the front and below. FIG. 2 is an exploded perspective view of the working machine 1 seen from the rear and above. FIG. 2 is an exploded perspective view of the working machine 1 seen from the rear and below. FIG. 3 is a perspective view of a working machine according to a comparative example. Same side view. The same plan view. XVI-XVI sectional view of FIG. 14. XVII-XVII sectional view of FIG. 15. FIG. 2 is an exploded perspective view of a work machine according to a second embodiment of the present invention. FIG. 19 is an exploded perspective view of the state in which the substrate 41A is accommodated in the container portion 63e from the state shown in FIG. 18. FIG. 3 is a front view of a work machine according to a second embodiment. FIG. 3 is a plan view of a work machine according to a second embodiment. FIG. 3 is an exploded perspective view of a working machine according to Embodiment 3 of the present invention.

In the following, the same or equivalent components, members, etc. shown in each drawing are denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. The embodiments are illustrative rather than limiting. All features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 12. This embodiment relates to a working machine 1. Work machine 1 is a grinder. FIG. 1 defines mutually orthogonal front-rear, up-down, left-right directions of the working machine 1. The front-rear direction is a direction parallel to the output shaft 6a of the motor 6. The vertical direction is a direction parallel to the axial direction of the spindle 8.

The housing of the working machine 1 includes a motor case 3, a gear case 4, a container section 10, a cover section 20, and a rear case 30. The gear case 4 is made of metal such as aluminum, for example. The motor case 3, the container part 10, the cover part 20, and the rear case 30 are, for example, insulating resin molded bodies, and the outer peripheral surfaces thereof serve as grip parts for the operator. FIG. 2 shows the range of the gripping portion in the front-rear direction.

Motor case 3 accommodates motor 6 therein. The motor 6 is a well-known inner rotor type brushless motor. The motor 6 has a rotor 6b and a stator 6c. A fan 2 is housed in the motor case 3 in front of the motor 6. The fan 2 is attached to the output shaft 6a of the motor 6 and rotated by the motor 6.

The gear case 4 is connected and fixed to the front end of the motor case 3 by screws or the like. An exhaust port (air window) 4a is provided on the front surface of the gear case 4. The gear case 4 accommodates therein a well-known rotation transmission mechanism that combines two bevel gears (not shown). This rotation transmission mechanism decelerates the rotation of the motor 6 and converts the direction of the rotation axis from the longitudinal direction to the vertical direction by 90 degrees, and transmits the rotation to the spindle 8. A grindstone 8a is attached to the lower end of the spindle 8 so as to be rotatable therewith.

The container portion 10 is connected and fixed to the rear end portion of the motor case 3 with screws 14 as fasteners. The container portion 10 has a bottomed container shape that extends in the front-rear direction. Specifically, as shown in FIG. 4, a container-like structure is formed by a bottom portion 10a located above and a side wall 10b extending downward from the end of the bottom portion 10a. That is, the container portion 10 opens downward. Note that the bottom portion 10a is curved to match the shape of the main body. The outer peripheral surface of the container portion 10 forms the outer shell of the working machine 1. The container section 10 accommodates a first circuit board 41 and a second circuit board 42 therein. The first circuit board 41 and the second circuit board 42 are both arranged perpendicular to the up-down direction and substantially parallel to each other. The first circuit board 41 and the second circuit board 42 are electrically connected to each other by pins 50, as shown in FIG. A second circuit board 42 is located above the first circuit board 41.

A control circuit (controller) for controlling the motor 6 is mounted on the first circuit board 41 and the second circuit board. Electronic components mounted on the lower surface of the first circuit board 41 include, for example, a choke coil 45, six switching elements 46, a capacitor 47, and a diode bridge 49. The six switching elements 46 are provided in the current path of the motor 6 and constitute an inverter circuit that supplies drive current to the motor 6. The switching element 46 is provided with fins 51 for heat radiation. The six switching elements 46 are provided separately, three each on the left and right.

The partition 52 partitions between the left and right switching elements 46 and also partitions between adjacent switching elements 46 on the left side. Further to the left of the left switching element 46, three tab terminals 48 are provided. Behind the switching element 46, a choke coil 45, a capacitor 47, and a diode bridge 49 are arranged in the left-right direction. Diode bridge 49 is provided with fins 53 .

The inside of the container part 10 is filled with silicone resin 43. Silicone resin 43 is an example of an insulating resin. The silicone resin 43 is a thermosetting resin. Silicone resin 43 covers first circuit board 41 and second circuit board 42 . In other words, the first circuit board 41 and the second circuit board 42 are located inside the cured silicone resin 43. The silicone resin 43 has a depth that covers the bottom surface of the first circuit board 41 and protects the control circuits provided on the first circuit board 41 and the second circuit board 42. In the exploded perspective views shown in FIGS. 9 to 12, the silicone resin 43 containing the first circuit board 41 and the second circuit board 42 is spaced apart from the container part 10 so that the internal structure of the container part 10 can be easily seen. However, since the silicone resin 43 is hardened inside the container part 10, it is not configured to be removable. A sensor board 44 is provided upright at the front end of the container section 10 substantially perpendicular to the front-rear direction. The sensor board 44 is provided at the rear of the motor 6 and faces a magnet 6m that rotates together with the output shaft 6a. A switch 9 operated by an operator is provided at the rear end of the container section 10. The switch 9 switches between energizing and stopping the motor 6, that is, driving and stopping the working machine 1.

The container portion 10 has a boss 13 through which a screw 14 passes in the front-rear direction. The boss 13 is located above the internal space filled with the silicone resin 43. The slit 11 is provided to expose the boss 13 and the screw 14 (to access the boss 13 and the screw 14) when the screw 14 is attached or removed. The slit 11 is a portion cut from the rear end of the upper surface of the container portion 10 in parallel to the front-rear direction. Rail receivers 12 are provided on both left and right sides of the slit 11, respectively. The rail receiving portion 12 is a groove extending in the front-rear direction.

The cover portion 20 is connected and fixed to the rear end portion of the motor case 3 using screws 24 as fasteners. The cover portion 20 has a semi-cylindrical shape with the front-rear direction as its axis. The outer peripheral surface of the cover portion 20 forms the outer shell of the working machine 1. The cover part 20 covers the lower part of the container part 10. The cover part 20 is connected and fixed to the lower part of the container part 10 at both front and rear ends by screws 25 and 26 as fasteners, and covers (closes) the lower opening of the container part 10. The cover part 20 and the container part 10 are combined with each other to form a cylindrical shape, preferably a substantially cylindrical shape. The outer circumferential surfaces of the cover portion 20 and the container portion 10 are continuous with the outer circumferential surface of the motor case 3 in the front-rear direction. That is, the substantially cylindrical shape is continuous from the motor case 3 to the rear part of the container part 10.

The cover portion 20 has a boss 23 through which a screw 24 passes in the front-rear direction. The slit 21 is provided to expose the screw 24. It is provided to expose the boss 23 and the screw 24 (to access the boss 23 and the screw 24) when attaching and detaching the screw 24. The slit 21 is a portion cut from the rear end of the lower surface of the cover portion 20 in parallel to the front-rear direction. Rail receiving portions 22 are provided on both left and right sides of the slit 11, respectively. The rail receiving portion 22 is a groove extending in the front-rear direction.

The rear case 30 is connected and fixed to the rear end of the container portion 10 with screws 34 as fasteners. The rear case 30 has a base portion 31, an upper cover portion 32, and a lower cover portion 33. The base 31 has a cylindrical shape with the front-rear direction as its axis and an open front end. The outer circumferential surface and rear end surface of the base portion 31 form the outer shell of the working machine 1. The outer circumferential surface of the base portion 31 is continuous with the outer circumferential surfaces of the container portion 10 and the cover portion 20 in the front-rear direction.

An intake port (air window) 31 a is provided on the rear end surface of the base 31 . The intake port 31a serves as an inlet for cooling air CA2 indicated by an arrow in FIG. Cooling air CA2 is cooling air for cooling the controller. The cooling air CA2 flows forward through the internal space of the container section 10 and cools the control circuits of each electronic component etc. provided on the first circuit board 41. The cooling air CA2 then flows further forward, passes through the vent 29 shown in FIG. 4 at the front end of the cover part 20, cools the motor 6, and is discharged from the exhaust port 4a. The cord armor 5a and the power cord 5 are held at the rear end of the base 31. The power cord 5 is connected to an external AC power source. The power cord 5 is a power supply section that supplies power to the motor 6. That is, the base 31 functions as a holding section for the power supply section. Cord armor 5a protects the base end of power cord 5. Note that illustration of the power cord 5 is omitted except in FIG. 1.

The upper cover part 32 extends forward from the top of the base part 31 and engages with and fills the slit 11 of the container part 10. Both left and right end portions of the upper cover portion 32 are convex rail portions 32a that engage with the rail receiving portions 12 of the container portion 10. The upper surface of the upper cover section 32 is continuous with the outer circumferential surface of the container section 10 in the circumferential direction. At the rear of the upper cover portion 32, an air intake port (air window) 32b is provided. The intake port 32b serves as an inlet for the cooling air CA1 indicated by an arrow in FIG. Cooling air CA1 is cooling air for cooling the motor. The cooling air CA1 flows forward without passing through the internal space of the container part 10, passes through the vent 19 shown in FIG. 4 at the front end of the container part 10, cools the motor 6, and is discharged from the exhaust port 4a.

The lower cover part 33 extends forward from the lower part of the base part 31 and engages with and fills the slit 21 of the cover part 20 . Both left and right end portions of the lower cover portion 33 are convex rail portions 33a that engage with the rail receiving portions 22 of the cover portion 20. The lower surface of the lower cover section 33 is continuous with the outer circumferential surface of the cover section 20 in the circumferential direction.

The procedure for assembling the housing of the working machine 1 will be explained. The container section 10 accommodates a first circuit board 41 and a second circuit board 42, and is filled with silicone resin 43 and hardened. The container part 10 and the cover part 20 are fixed to each other by screws 25 and 26. The container part 10 is fixed to the motor case 3 with screws 14, and the cover part 20 is fixed to the motor case 3 with screws 24. The rear case 30 is assembled to the container part 10 and the cover part 20 while inserting the upper cover part 32 and the lower cover part 33 into the slits 11 and 21. The rear case 30 is fixed to the container part 10 with screws 34.

The insulation structure of the housing of the working machine 1 will be explained. As shown in FIG. 12 and the like, lower end portions on both left and right sides of the inner circumferential surface of the container portion 10 are flat mating surfaces 18, respectively. The upper end portions on both left and right sides of the outer peripheral surface of the cover portion 20 are flat mating surfaces 28 . As shown in FIG. 4, the mating surfaces 18 and 28 overlap in the vertical direction and are in face-to-face contact in the left-right direction. That is, the lower end portion of the container portion 10 and the upper end portion of the cover portion 20 engage with each other in a stepped manner. Thereby, a large creepage distance can be secured from the conductive part inside the container part 10 to the boundary between the outer peripheral surface of the container part 10 and the outer peripheral surface of the cover part 20 in the exposed part. Since the mating surface 28 is located one step inside, the outer circumferential surface of the container portion 10 and the outer circumferential surface of the cover portion 20 are continuous without a step difference in the exposed portion.

As shown in FIG. 9 and the like, the rear end portion of the outer peripheral surface of the motor case 3 is a mating surface 3c. The front end of the inner circumferential surface of the container portion 10 is a mating surface 17 . The front end of the inner peripheral surface of the cover portion 20 is a mating surface 27 . As shown in FIG. 6, the mating surfaces 3c and 17 overlap in the front-rear direction and are in face-to-face contact with the motor 6 in the radial direction. That is, the front end of the container portion 10 and the rear end of the motor case 3 engage in a stepped manner. Thereby, a large creepage distance can be ensured from the screw 14 to the boundary between the outer circumferential surface of the container portion 10 and the outer circumferential surface of the motor case 3 in the exposed portion. Similarly, the mating surfaces 3c and 27 overlap in the front-rear direction and are in face-to-face contact with the motor 6 in the radial direction. That is, the front end of the cover part 20 and the rear end of the motor case 3 are engaged in a stepped manner. Thereby, a large creeping distance can be ensured from the screw 24 to the boundary between the outer circumferential surface of the cover portion 20 and the outer circumferential surface of the motor case 3 in the exposed portion. Since the mating surface 3c is located one step inside, there is no difference in level between the outer peripheral surfaces of the container portion 10 and the cover portion 20 and the outer peripheral surface of the motor case 3 in the exposed portion, so that they are continuous.

As shown in FIG. 6 and the like, the upper cover portion 32 and the boss 13 overlap in the front-rear direction. In the overlapping portion, the lower surface (inner surface) of the upper cover portion 32 and the upper surface of the boss 13 are in face-to-face contact in the radial direction of the motor 6. Thereby, a large creepage distance can be ensured from the screw 14 to the boundary between the outer circumferential surface of the container part 10 and the front end of the upper cover part 32 in the exposed part. Similarly, the lower cover portion 33 and the boss 23 overlap in the front-rear direction. In the overlapping portion, the upper surface (inner surface) of the lower cover portion 33 and the lower surface of the boss 23 are in face-to-face contact with each other in the radial direction of the motor 6 . Thereby, a large creeping distance can be ensured from the screw 24 to the boundary between the outer circumferential surface of the cover part 20 and the front end of the lower cover part 33 in the exposed part.

According to this embodiment, the following effects can be achieved.

(1) The container part 10 accommodates the first circuit board 41 and the second circuit board 42 and is filled with silicone resin 43, and forms the outer shell of the housing of the working machine 1. Therefore, compared to the case where a separate container-shaped case is provided in the housing, the outer diameter of the housing can be reduced while obtaining the effect of circuit protection by the silicone resin 43, and the main body of the working machine 1 can be made smaller. Further, the outer circumferential surface of the container portion 10 is a part of the gripping portion of the working machine 1, and by reducing the diameter of the gripping portion, it becomes easier to grip and work efficiency is improved. Furthermore, since a case for accommodating the circuit board is not required, the number of parts can be reduced. Furthermore, the resin can protect the circuit board and position it relative to the housing at the same time, improving ease of assembly.

(2) In order to fix the container part 10 and cover part 20 to the motor case 3 with the screws 14 and 24 at the top and bottom of the first circuit board 41, as shown in FIG. ) can be suppressed to the sum of the width of the first circuit board 41 in the left-right direction and the thickness of the left and right parts of the container part 10. The outer dimension of this part is the part that requires the longest length in order to accommodate the wide first circuit board 41, and this was a bottleneck in reducing the diameter when making the grip part cylindrical. With the configuration of this embodiment, it is possible to suitably reduce the diameter.

(3) step-like engagement between the lower end of the container part 10 and the upper end of the cover part 20; step-like engagement between the front ends of the container part 10 and the cover part 20 and the rear end of the motor case 3; Due to the overlapping structure in the front-rear direction between the upper cover part 32 and the boss 13 and the overlapping structure in the front-rear direction between the lower cover part 33 and the boss 23, the conductive parts and screws 14, 24 in the container part 10 can be connected to the grip part. A large creepage distance can be ensured with a simple configuration.

(4) The cooling air CA1 taken in from the intake port 32b flows forward without passing through the internal space of the container portion 10 to cool the motor 6. Therefore, the cooling air that has not been warmed by directly hitting the control circuit can be supplied to the motor 6, and the cooling performance of the motor 6 is improved.

(5) Since the intake port 32b is located far from the screw 14 and at a distance from the internal space of the container portion 10, problems with insulation can be suppressed.

(Comparative example)
The configuration of a working machine of a comparative example will be briefly described with reference to FIGS. 13 to 17. The outer shell of this work machine is composed of a motor case 3A, a tail cover 3B, and a gear case 4. The tail cover 3B has a cylindrical shape and is fixed to the rear part of the motor case 3A by screws or the like. A container portion 59 is provided inside the tail cover 3B. The first circuit board 41 and the second circuit board 42 are housed inside the container part 59, and the silicone resin 43 is filled therein. In the configuration of this comparative example, a container portion 59 that accommodates the first circuit board 41 and the second circuit board 42 is separately provided inside the tail cover 3B. For this reason, the main body becomes large and the outer diameter of the tail cover 3B, which is also a gripping portion, becomes large, making it difficult to grip and making it difficult to use. The first embodiment described above preferably solves these problems.

(Embodiment 2)
The configuration of a working machine according to the second embodiment of the present invention will be described with reference to FIGS. 18 to 21. This work machine is a portable circular saw. The bottom surface of the base 66 is a sliding surface on a material to be cut, such as wood. The outer shell of the working machine is composed of a motor case 62, a handle housing 63, and a saw cover 65, which are connected and fixed to each other. The motor case 62 and the handle housing 63 are, for example, insulating resin molded bodies. The saw cover 65 is made of metal such as aluminum, for example. The motor case 62 houses the motor (brushless motor) 6 therein. The motor case 62 has an air intake port (air window) 62a. The handle housing 63 has a grip portion 63h for being gripped by an operator.

The circular saw blade 64 is rotationally driven by the motor 6 via a gear. The saw cover 65 is attached to the motor case 62 and covers approximately the upper half of the outer periphery of the circular saw blade 64. A protective cover 77 is attached to the saw cover 65. The protective cover 77 has a shape that covers approximately half of the outer circumference of the circular saw blade 64. The protective cover 77 is rotatably held within the saw cover 65 coaxially with the drive shaft of the circular saw blade 64 . The motor case 62 and handle housing 63 are connected to the base 66 via the saw cover 65. The saw cover 65 can swing vertically relative to the base 66 using a well-known swing support mechanism, and can tilt at least left or right using a well-known tilt support mechanism.

The centrifugal fan 67 is attached and fixed to the output shaft 6a of the motor 6, and is rotated by the drive of the motor 6. The cooling air generated by the centrifugal fan 67 cools the motor 6 and the control circuit provided on the circuit board 41A. The grip portion 63h of the handle housing 63 is provided with a trigger switch 63g for switching between starting and stopping the working machine. The power cord 5 is pulled out from the lower rear end of the handle housing 63.

As shown in FIGS. 18 and 19, the handle housing 63 includes a left handle housing 63a and a right handle housing 63b, which are fixed to each other and integrated by screws or the like. The right handle housing 63b has a container portion (board accommodating portion) 63e at a position behind the motor case 62. The right side of the bottom of the container portion 63e forms part of the outer shell of the right handle housing 63b. The container portion 63e includes four side wall portions 63f erected at the bottom thereof. The circuit board 41A is housed in the container part, and is filled with silicone resin (not shown). The circuit board 41A is provided with a switching element for supplying power to the motor 6, a diode bridge for rectification, and the like.

The left handle housing 63a has a cover portion 63c at a position behind the motor case 62. The cover portion 63c covers the aforementioned container portion. The outer surface of the cover portion 63c forms part of the outer shell of the left handle housing 63a. The cover portion 63c is provided with an exhaust port (air window) 63d. According to this embodiment, the right handle housing 63b has the container portion 63e, and the right surface of the container portion 63e forms part of the outer shell of the right handle housing 63b, compared to a case where a separate container portion is provided. Thus, the handle housing 63 can be made smaller. Furthermore, the number of parts can also be reduced.

(Embodiment 3)
FIG. 22 is an exploded perspective view of a working machine according to Embodiment 3 of the present invention. This working machine is an impact wrench that uses a motor (brushless motor) 6 as a driving source. The right housing 83a and the left housing 83b are fixed and integrated with each other by screws or the like. A trigger switch 83g for switching between driving and stopping the motor 6 is provided on the grip portion 83d. The motor 6 is housed in the motor housing section 83c. A drive circuit board 84 equipped with an inverter circuit and a Hall IC is provided behind the motor 6. A hammer case 85 housing a power transmission mechanism is provided in front of the motor housing portion 83c.

The left housing 83b has a container portion (substrate accommodating portion) 83e in a portion that is inside the grip portion 83d. The left side of the bottom of the container portion 83e forms part of the outer shell of the left housing 83b. The container portion 83e includes four side wall portions 83f erected from the bottom thereof. A portion of the right housing 83a that faces the bottom of the container portion 83e is a cover portion. The container portion 83e accommodates the circuit board 41B and is filled with a silicone resin (not shown). The circuit board 41B is provided with a microcontroller as a control circuit, a filter circuit, and the like. According to this embodiment, the left housing 83b has the container part 83e, and the left surface of the container part 83e forms part of the outer shell of the left housing 83b, so it is easier to grip than when a separate container part is provided. The portion 83d can be made smaller (reduced in diameter).

Although the present invention has been described above using the embodiments as examples, those skilled in the art will understand that various modifications can be made to each component and each processing process of the embodiments within the scope of the claims. By the way. Modifications will be discussed below.

In the first embodiment, the wind window may be provided in the cover portion 20 or the lower cover portion 33. The working machine of the present invention is not limited to a corded type that operates using power supplied from an external AC power source, but may also be a cordless type that operates using power from a battery pack. In this case, in the work machine 1 according to the first embodiment, a battery pack mounting part to which a battery pack can be attached and detached may be provided at the base 31 of the rear case 30.

1 grinder, 2 fan, 3 motor case, 3a, 3b screw holes, 3c mating surface, 4 gear case, 4a exhaust port (air window), 5 power cord, 5a cord armor, 6 motor, 6a output shaft, 6b rotor, 6c stator , 6m magnet, 7 foil guard, 8 spindle, 8a grindstone, 9 switch, 10 container, 11 slit, 12 rail receiver, 13 boss, 14 screw, 17, 18 mating surface, 19 vent, 20 cover, 21 Slit, 22 Rail receiver, 23 Boss, 24-26 Screw, 27, 28 Matching surface, 29 Vent, 30 Rear case, 31 Base, 31a Air intake (air window), 32 Upper cover, 32a Rail, 32b Air intake Mouth (air window), 33 lower cover part, 33a rail part, 34 screw, 41 first circuit board, 41A, 41B circuit board, 42 second circuit board, 43 silicone resin, 44 sensor board, 45 choke coil, 46 switching Element, 47 Capacitor, 48 Tab terminal, 49 Diode bridge, 50 Pin, 51 Fin, 52 Partition, 53 Fin, 59 Container, 62 Motor case, 62a Intake port (air window), 63 Handle housing, 63a Left handle housing, 63b Right handle housing, 63c Cover part, 63d Exhaust port (air window), 63e Container part (board storage part), 63f Side wall part, 63g Trigger switch, 63h Grip part, 64 Circular saw blade, 65 Saw cover, 66 Base, 67 Centrifugal fan , 77 protective cover, 83a right housing, 83b left housing, 83c motor accommodating part, 83d grip part, 83e container part (board accommodating part), 83f side wall part, 83g trigger switch, 84 drive circuit board, 85 hammer case, CA1, CA2 Cooling air.

Claims (10)

A working machine having a housing that accommodates a motor,
The housing includes a motor case that accommodates the motor, a container-like container portion connected to the motor case, and a holding portion that holds a power supply portion that supplies power to the motor,
A portion of the container portion forms an outer shell of the housing ,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit ,
A working machine , wherein one end of the container part is connected to the motor case, and the other end of the container part is connected to the holding part in the extending direction of the circuit board . The working machine according to claim 1, wherein the power supply section is a power cord, and the holding section supports a cord armor that protects the power cord. The housing accommodates a fan rotated by the motor, and is provided with a wind window for generating cooling air within the housing by rotation of the fan,
The working machine according to claim 1 or 2, wherein the control circuit is cooled by the cooling air . a housing that accommodates the motor;
a fan rotated by the motor;
The housing includes a motor case accommodating the motor, and a container portion connected to the motor case,
A portion of the container portion forms an outer shell of the housing,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit,
The housing includes a holding part that is a separate member from the container part and holds a power supply part that supplies power to the motor,
A working machine, wherein a wind window for generating cooling air in the housing by rotation of the fan is provided in the holding part , and the control circuit is cooled by the cooling air . a housing that accommodates the motor;
a fan rotated by the motor;
The housing includes a motor case that accommodates the motor, a container-shaped container portion connected to the motor case, and a cover portion configured as a separate member from the container portion and covering the container portion. ,
A portion of each of the container portion and the cover portion constitutes an outer shell of the housing,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit,
A working machine, wherein the cover portion is provided with a wind window for generating cooling air in the housing by rotation of the fan , and the control circuit is cooled by the cooling air . The working machine according to claim 5, wherein the container section opens in a predetermined direction, and a side in the predetermined direction is covered by the cover section. The working machine according to claim 5, wherein a heating element or a heat radiating member, at least a portion of which is exposed through the opening of the container portion, is located on a side of the circuit board in a predetermined direction and is cooled by the cooling air. A working machine having a housing that accommodates a motor,
The housing includes a motor case accommodating the motor, and a container portion connected to the motor case,
A portion of the container portion forms an outer shell of the housing,
The container section accommodates a circuit board on which a control circuit for controlling the motor is mounted, and is filled with resin that covers at least a portion of the control circuit,
one end of the container part is connected to the motor case by a fastener,
The container portion has a slit that exposes the fastener,
A working machine, wherein a cover part that fills the slit is attached to the container part. The working machine according to claim 8 , wherein at least a part of the cover portion forms an outer shell of the working machine. The motor has a rotor that rotates with the front-rear direction as an axis,
The housing has a gear case that is connected to the front side of the motor case and holds a spindle to which a tip tool is fixed.
The working machine according to claim 5, wherein the container part and the cover part are located behind the motor case and form part of an outer shell of the housing, which has a substantially cylindrical shape.

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