WO2020195868A1

WO2020195868A1 - Battery-type electric power tool

Info

Publication number: WO2020195868A1
Application number: PCT/JP2020/010698
Authority: WO
Inventors: 崇太藤森; 聡哉横山; 淳井戸田; 史雄稲垣
Original assignee: 日東工器株式会社
Priority date: 2019-03-25
Filing date: 2020-03-12
Publication date: 2020-10-01
Also published as: JPWO2020195868A1; AU2020249745A1; DE112020001504T5; JP7220279B2; AU2020249745B2; CN113661032A

Abstract

[Problem] To provide a battery-type electric power tool configured to be able to suppress suction of external dust, etc., into a tool body. [Solution] A battery-type electric power tool 1 has: a housing 24 having an intake port 46 and an exhaust port 48; a motor 26 that is mounted in the housing; a tool drive part 38 that is driven to rotate by the motor 26; a cooling fan 30 that rotates along with the motor 26; and a battery attachment part 32 that is provided to a peripheral wall 24-3 of the housing 24 and that allows the battery 14 to be detachably attached onto the outer surface of the peripheral wall 24-3. The battery attachment part 32 defines an air intake space 74 that has an upward opening 74-1 disposed, so as to be directed upwardly, between the attached battery 14 and a portion, of the peripheral wall 24-3, where the intake port 46 is provided.

Description

Battery-powered power tools

The present invention relates to a battery-powered power tool, and more particularly to a battery-powered power tool having a structure in which outside air is sucked into the housing by a cooling fan arranged in the housing to cool a member arranged in the housing. ..

Conventionally, battery-powered power tools such as portable jigsaws and drilling machines that are driven by electric power supplied from a battery have been known. Further, in such a battery-powered power tool, in order to cool a heating element such as a motor or a control circuit in the tool body, a cooling fan arranged in the tool body is rotated by the motor to rotate the outside air in the tool body. There is something that takes in. Specifically, by arranging heating elements such as a motor and a control circuit between the intake port and the exhaust port provided in the tool body, the outside air sucked from the intake port hits these heating elements to generate heat. It is designed to cool the body (Patent Document 1).

Japanese Patent No. 4998846

Power tools are generally used in dusty and dusty environments. It is also sometimes used in an environment wet with water or oil. In particular, in the case of an electric tool for cutting or drilling a work piece such as a jigsaw or a punch, chips of the work piece are generated. When a power tool having a cooling structure as described above is used in such an environment, dust such as chips, water, oil, etc. scattered around the work piece together with the outside air from the intake port are combined with the tool. It may be sucked into the main body and cause the motor or circuit in the tool body to break down.

An object of the present invention is to provide a battery-powered power tool capable of suppressing such dust and the like from being sucked into the tool body.

That is, the present invention
A housing having a bottom wall on the side facing the workpiece during machining work, a top wall at an upper position facing the bottom wall, and a peripheral wall between the bottom wall and the top wall, and the outside of the housing is inside the housing. It has an intake port for taking in the air and an exhaust port for discharging air from the housing to the outside of the housing, and at least the intake port is a housing provided on the peripheral wall.
With the motor mounted in the housing
A tool drive unit attached to the housing and driven by the motor,
It is mounted inside the housing and rotates with the rotation of the motor, and air outside the housing is sucked into the housing through the intake port and discharged to the outside of the housing through the exhaust port, and the inside of the housing is cooled by the air. With a cooling fan to be
A battery mounting portion that is provided on the peripheral wall of the housing and detachably mounts a battery that supplies electric power to the motor on the outer surface of the peripheral wall. When the battery is mounted, the battery and the peripheral wall thereof. An air intake space having an upward opening directed upward is defined between the portion provided with the intake port, and when the cooling fan rotates, the upward opening, the air intake space, and the air intake space are defined. A battery mounting part that allows air to be sucked into the housing through the intake port,
To provide a battery-powered power tool having.

In this battery-powered power tool, the air sucked into the housing is mainly sucked from above. Therefore, especially when cutting a horizontally placed work piece from above, the work is performed. It is possible to prevent the cutting pieces and dust scattered on the work piece and workbench around the battery-powered power tool being sucked into the housing. Further, by forming such an air intake space by using the mounted battery, the shape of the housing is simpler than that in the case where a similar air intake space is formed in the housing itself. It becomes possible to make it. The terms such as "upper", "bottom wall", and "top wall" used in the present specification are used to define the relative positional relationship of the battery-powered power tool in the housing. It is not intended to specify the absolute position or direction with respect to the direction of gravity. For example, when the "bottom wall" is on the upper side with respect to the vertical direction, which is the direction of gravity, the "top wall" is located below the "bottom wall", and the direction of the battery-powered power tool is based on the vertical direction. It does not always match the direction.

In the battery-powered power tool, the battery mounting portion can have a bottom plate extending from the peripheral wall of the housing so as to cover the bottom surface of the mounted battery at least partially from below. When cutting a horizontally placed workpiece from above, the bottom plate is positioned to shield the air intake space from scattered workpieces such as facets and worktables, and the facets into the housing. It is possible to more reliably suppress suction such as.

The battery mounting portion is provided with a battery facing portion that prevents air from flowing into the air intake space from below in contact with or close to the mounted battery at a position below the intake port. You can also do it.

The air intake space may also have a side opening that opens toward at least one of the left and right directions to allow air to flow into the air intake space. It assists in sucking air into the housing.

Further, when the battery is mounted, the battery mounting portion is such that an extension lower space continuous with the air intake space is defined between the peripheral wall and the battery at a position continuing downward from the intake port. You can also do it. Considering the relatively heavy dust that may be contained in the air that has flowed into the upward opening, such dust falls into the extension lower space when it is changed direction and sucked into the intake port. It is possible to prevent suction into the housing.

In the battery-powered power tool according to the present invention, the tool drive portion is arranged in the front portion of the housing, the peripheral wall is composed of a front side wall portion, a rear side wall portion, and left and right side wall portions, and the intake port is rearward. It can be provided on the side wall so that the battery mounting portion is provided on the rear side wall. By setting the tool drive portion and the battery mounting portion in such a positional relationship, it is possible to more effectively suck the facets and the like to the housing.

Further, the housing has a rectangular parallelepiped shape extending in the front-rear direction, and the tool drive unit, the cooling fan, and the motor are arranged in the housing in the horizontal direction in order from the front to the rear and mounted in the housing. You can also have it. By doing so, it is possible to reduce the vertical width of the housing and reduce the length of the battery-powered power tool.

In the battery-powered power tool according to the present invention, at least a part of a control circuit for controlling the motor is arranged between the motor and the intake port, and the housing is provided with air sucked from the intake port. Can be further provided with a guide portion pointing at at least a part of the control circuit. This is to efficiently cool the control circuit that generates heat.

The battery-powered power tool according to the present invention is further provided with a motor holding member which is tubular and holds the motor coaxially inside, and air sucked from the intake port passes through the motor holding member. After that, it can be directed to the exhaust port. This is to perform forced cooling of the motor.

The exhaust port can be provided at a position adjacent to the cooling fan. This is to efficiently exhaust air in order to improve the cooling effect.

The battery mounting portion can be mounted so that the battery fits within the height width of the housing. This is to reduce the length of the battery-powered power tool.

The battery-powered power tool according to the present invention can be further attached to the lower surface side of the bottom wall of the housing to further include a fixture for fixing the housing to the workpiece. When drilling a work piece or the like, the battery-powered power tool can be fixed to the work piece. The fixture may be one that is mechanically fixed or one that is magnetically fixed.

In this case, the bottom wall has a horizontal portion extending horizontally from the front to the rear and an inclined portion inclined rearward and downward from the rear end of the horizontal portion to the rear end of the housing, and the fixture has the fixture. Attached to a horizontal portion, the fixture may be provided with a stabilizer that extends rearward to the underside of the battery mount. Such a configuration is for reducing the length of the battery-powered power tool. The stabilizer is for preventing the battery-powered tool from being lifted from the work piece due to the reaction when the tool is pressed against the work piece in the work of the battery-powered power tool. The stabilizer can also protect the battery mount if the battery-powered tool is accidentally dropped.

In this case, the tool drive portion has a tool mounting portion at the lower end thereof to which a work tool can be detachably attached, a retracting position where the tool mounting portion is retracted into the housing, and the tool mounting portion is the housing. It can be made displaceable from the extension position extending downward from.

Further, in the battery-powered power tool according to the present invention, the housing is rotatably attached to the housing about an axis extending horizontally in the left-right direction of the housing between a pair of legs and the legs. An inverted U-shaped handle composed of an extending grip portion, the grip portion extending upward from the axis so that the grip portion can be gripped by the user, and the grip portion of the housing. A handle that can be displaced from a storage position that is housed in a recess provided in the top wall can be provided. This is intended to facilitate the carrying of the battery-powered power tool.

Hereinafter, embodiments of the battery-powered power tool according to the present invention will be described with reference to the accompanying drawings.

It is a side view of the battery-powered power tool which concerns on one Embodiment of this invention. It is sectional drawing in line II-II of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is a perspective view of the battery-powered power tool of FIG. 1 with the battery removed.

As shown in FIG. 1, the battery-powered power tool 1 according to the embodiment of the present invention includes a tool body 10 and a fixing portion 12 attached to the lower side of the tool body 10. A battery 14 is detachably attached to the rear portion of the tool body 10. An annular cutter (working tool) 16 is detachably attached to the front position of the tool body 10. The fixing portion 12 includes an electromagnet type fixing tool 20 and a stabilizer 22 extending rearward from the electromagnet type fixing tool 20. The battery-powered power tool 1 is a drilling machine in which a rotating annular cutter 16 is lowered by operating a lever 18 to drill a metal workpiece. When performing the drilling process, the tool body 10 is fixed to the workpiece by magnetically attracting the electromagnet type fixture 20 of the fixing portion 12 to the workpiece. During the drilling process, the annular cutter 16 pressed against the work piece receives a force that lifts the front part of the tool body 10 upward due to the reaction force received from the work piece, but the stabilizer 22 comes into contact with the work piece. By doing so, it is more surely prevented from floating.

As shown in FIGS. 2 and 3, the tool body 10 includes a housing 24, a motor 26 arranged in the housing 24, a cooling fan 30 attached to a rotating shaft 28 of the motor 26, and driving power to the motor 26. Has a battery mounting portion 32 to which the battery 14 for supplying the power is mounted. The motor 26 is arranged so that its rotation axis R faces the front-rear direction (horizontal direction as seen in the drawing) of the tool body 10, and is coaxial with the inside of the motor holding member 34 extending in the front-rear direction in a tubular shape in the housing 24. It is held in a shape. The rotating shaft 28 of the motor 26 is driven and connected to the tool driving unit 38 via the reduction gear mechanism 36. The tool drive unit 38 is a tubular member that can rotate about a rotation axis extending vertically as a whole and can be displaced in the vertical direction, and an annular cutter 16 is detachably attached to the lower end thereof. A tool mounting portion 40 is provided. The tool drive unit 38 is provided with a feed mechanism 44 including a rack 42 provided so as to extend vertically on the outer surface thereof and a pinion 41 attached to the rotation shaft of the lever 18 and meshing with the rack 42. It moves up and down with the rotation operation. The tool drive portion 38 is displaceable between a retracted position in which the tool mounting portion 40 is retracted into the housing 24 and an extension position in which the tool mounting portion 40 extends downward from the housing 24. .. As shown in the figure, a tool drive unit 38, a feed mechanism 44, a reduction gear mechanism 36, a cooling fan 30, and a motor 26 are arranged in this order in the horizontal direction from the front to the rear of the housing 24.

The housing 24 has a rectangular parallelepiped shape that extends long in the front-rear direction as a whole. The housing has a bottom wall 24-1 such that the fixing portion 12 is fixed to the work piece and faces the work piece when drilling, and a top wall at an upper position facing the bottom wall 24-1. It has a 24-2 and a peripheral wall 24-3 between the bottom wall 24-1 and the top wall 24-2. The peripheral wall 24-3 is composed of a front side wall portion 24-4, a rear side wall portion 24-5, and left and right side wall portions 24-6 extending between the front side wall portion 24-4 and the rear side wall portion 24-5. .. As shown in FIGS. 3 and 4, the housing 24 has an intake port 46 for sucking outside air into the housing 24 on the rear side wall portion 24-5 of the peripheral wall 24-3. Further, as shown in FIGS. 2 and 4, the housing 24 has an exhaust port 48 for exhausting the outside air sucked from the intake port 46 on the left and right side wall portions 24-6 of the peripheral wall 24-3. The intake port 46 is composed of a plurality of slit-shaped holes extending in the lateral direction, and is usually attached with a wire mesh filter 50. Further, a louver 52 extending diagonally upward toward the front is formed in the inner portion of the housing 24 of the intake port 46. The louver 52 prevents water from entering through the intake port 46. The exhaust port 48 is arranged so as to face diagonally rearward at a position adjacent to the cooling fan 30. In the illustrated example, the bottom wall 24-1 has a horizontal portion 24-1a extending rearward from the front position and an inclined portion 24-1b extending rearwardly and downwardly from the horizontal portion 24-1a to the rear end of the housing 24. An electromagnet type fixture 20 is fixed to the horizontal portion 24-1a, and the stabilizer 22 passes under the inclined portion 24-1-1b and is located under the battery 14. By doing so, the battery 14 is fitted within the height width of the housing 24, and the electromagnet type fixture 20 and the battery 14 are compactly fitted in the vertical direction of the battery-powered power tool 1. .. In the illustrated example, the housing 24 is provided with a handle 25 for carrying the battery-powered power tool 1. The handle 25 is an inverted U composed of a pair of legs 25-1 rotatably attached to the housing 24 about an axis extending horizontally in the left-right direction and a grip 25-2 extending between the legs. It has a character shape, and the grip portion 25-1 extends upward so that the grip portion 25-2 can be gripped by the user, and the grip portion 25-2 is provided on the top wall 24-2 of the housing 24. It is possible to displace it from the storage position stored in the recessed recess 24-7.

A control circuit 56 for controlling the motor 26 is further arranged in the housing 24. The control circuit 56 includes a circuit board 58 arranged in the front-rear direction on the upper side of the motor 26, an FET (field effect transistor) 60 arranged so as to extend downward from the circuit board 58, and a heat radiation fin 61 sandwiched between the FET 60s. And have. The FET 60 and the heat radiation fin 61, which are a part of the control circuit 56, are located between the intake port 46 and the motor 26. The FET 60 is an electronic component for adjusting the electric power supplied from the battery 14 to the motor 26, and heat is generated to a high temperature because a relatively large current flows.

When the cooling fan 30 is rotated by the motor 26, the outside air is sucked into the housing 24 from the intake port 46. The sucked air is directed upward by the louver 52, but downward along the wall surface 62 in front of the louver 52. A guide portion 64 that is inclined downward toward the front is formed at a lower position of the intake port 46 in the housing 24, and the sucked air is sent to the FET 60 and the heat radiation fin 61 of the control circuit 56 by the guide portion 64. You will be guided towards. Air hits the heat-generating FET 60 and the heat radiating fin 61, and the FET 60 and the heat radiating fin 61 are cooled. The air that has passed through the FET 60 and the heat radiating fin 61 cools the motor 26 by passing between the stator 66 of the motor 26 and the rotor 68 in the motor holding member 34. The air that has passed between the stator 66 and the rotor 68 passes through the cooling fan 30 and is exhausted from the exhaust port 48 to the outside of the housing 24. Since the exhaust port 48 faces diagonally rearward, the air is exhausted toward the rear. By passing the outside air through the housing 24 in this way, the battery-powered power tool 1 can efficiently cool the FET 60 and the motor 26 that generate heat during driving. By allowing air to be exhausted from the exhaust port 48 toward the rear, chips generated during drilling with the annular cutter 16 are prevented from being blown up by the exhaust.

The battery mounting portion 32 extends rearward from the bottom plate 32-1 extending rearward from the bottom wall 24-1 of the housing 24 and the left and right side wall portions 24-6 of the housing 24 so as to cover the bottom surface of the battery 14 from below. A support side portion 32-2 that supports the battery 14 from both sides, a battery facing portion 32-3 that extends vertically between both support side portions 32-2 and substantially contacts the mounted battery 14, and the battery. A terminal portion 32-4 provided at an intermediate position in the vertical direction (FIG. 4) of the facing portion 32-3 and electrically connected to the connection terminal of the mounted battery 14, and a center position in the width direction of the battery facing portion 32-3. It has a lock portion 32-6 provided with a surface 32-5 extending flush with the battery facing portion 32-3 to the height of the lower end of the intake port 46. A lock groove 32-7 is provided on the right side surface of the lock portion 32-6 as viewed in FIG. 4 to receive the lock portion (not shown) of the battery and lock the battery 14 to the battery mounting portion 32. The intake port 46 is provided at a position above the rear side wall portion 24-5 of the housing 24 located in front of the battery facing portion 32-3, and when the battery 14 is mounted on the battery mounting portion 32, the intake port 46 is provided. An air intake space 74 having an upward opening 74-1 that opens upward is formed between the upper half portion of the rear side wall portion 24-5 provided with the 46 and the battery 14, and the air intake space 74 is formed from the intake port 46. An extension lower space 76 continuous with the air intake space 74 is formed between the battery 14 and the rear side wall portion 24-5 at a position continuing to the lower side. In the illustrated example, the extension lower space 76 is provided so as to open laterally on both sides of the lock portion 32-6. The extension lower space 76 changes direction in the air intake space 74 and makes it possible to store dust falling from the outside air sucked into the intake port 46.

In the battery-powered power tool 1, since the air intake space 74 opened upward is formed between the battery 14 and the intake port 46 as described above, the outside air sucked from the intake port 46 is mainly upward. It will be sucked from below and will not be sucked from below. Therefore, in the drilling work, it is possible to suppress the suction of the facets and the like scattered around the battery-powered power tool 1. Further, by forming such an air intake space 74 by using the detachably mounted battery 14, as compared with the case where a similar air intake space 74 is formed only by the housing 24, The shape of the housing 24 can be simplified. In the embodiment, the air intake space 74 has a side opening 74-2 that opens to the left and right to allow air to flow into the air intake space 74.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. For example, in the above embodiment, the tool drive unit is arranged in the front part of the tool body and the intake port is arranged in the rear position, but other arrangements such as providing the intake port on either the left or right side wall portion are provided. It can also be. The fixture does not use an electromagnet, but may be in another form such as vacuum suction or a vise, and the fixing portion does not necessarily have to be provided. Furthermore, for example, a drill device that uses a drill as a work tool, or a jigsaw that uses a saw tooth as a work tool so that the tool mounting part is driven up and down, is a battery-powered electric machine other than a drilling machine. It may be used as a tool.

1 Battery-powered power tool 10 Tool body 12 Fixed part 14 Battery 16 Ring cutter (work tool)
18 Lever 20 Electromagnetic fixture 22 Stabilizer 24 Housing 24-1 Bottom wall 24-1a Horizontal part 24-1b Inclined part 24-2 Top wall 24-3 Peripheral wall 24-4 Front side wall part 24-5 Rear side wall part 24-6 Side wall part 24-7 Recessed part 25 Handle 25-1 Leg part 25-2 Grip part 26 Motor 28 Rotating shaft 30 Cooling fan 32 Battery mounting part 32-1 Bottom plate 32-2 Support side part 32-3 Battery facing part 32-4 Terminal Part 32-5 Surface 32-6 Lock part 32-7 Lock groove 34 Motor holding member 36 Reduction gear mechanism 38 Tool drive part 40 Tool mounting part 41 Pinion 42 Rack 44 Feed mechanism 46 Intake port 48 Exhaust port 50 Wire mesh filter 52 Louver 56 Control circuit 58 Circuit board 60 FET (Field effect transistor)
61 Heat dissipation fin 62 Wall surface 64 Guide part 66 Stator 68 Rotor 74 Air intake space 74-1 Upward opening 74-2 Side opening 76 Extension lower space R Rotating axis

Claims

A housing having a bottom wall on the side facing the workpiece during machining work, a top wall at an upper position facing the bottom wall, and a peripheral wall between the bottom wall and the top wall, and the outside of the housing is inside the housing. It has an intake port for taking in the air and an exhaust port for discharging air from the housing to the outside of the housing, and at least the intake port is a housing provided on the peripheral wall.
With the motor mounted in the housing
A tool drive unit attached to the housing and driven by the motor,
It is mounted inside the housing and rotates with the rotation of the motor, and air outside the housing is sucked into the housing through the intake port and discharged to the outside of the housing through the exhaust port, and the inside of the housing is cooled by the air. With a cooling fan to be
A battery mounting portion that is provided on the peripheral wall of the housing and detachably mounts a battery that supplies electric power to the motor on the outer surface of the peripheral wall. When the battery is mounted, the battery and the peripheral wall thereof. An air intake space having an upward opening directed upward is defined between the portion provided with the intake port, and when the cooling fan rotates, the upward opening, the air intake space, and the air intake space are defined. A battery mounting part that allows air to be sucked into the housing through the intake port,
Battery-powered power tools with.
The battery-powered power tool according to claim 1, wherein the battery mounting portion has a bottom plate extending from the peripheral wall of the housing so as to cover the bottom surface of the mounted battery at least partially from below.
The battery mounting portion has a battery facing portion that prevents air from flowing into the air intake space from below in contact with or close to the mounted battery at a position below the intake port. The battery-powered power tool according to 1 or 2.
The invention according to any one of claims 1 to 3, wherein the air intake space has a side opening that opens toward at least one of the left and right directions to allow air to flow into the air intake space. Battery-powered power tools.
When the battery is mounted, the battery mounting portion is configured such that an extension lower space continuous with the air intake space is defined between the peripheral wall and the battery at a position continuing downward from the intake port. , The battery-powered power tool according to any one of claims 1 to 4.
The tool drive portion is arranged in the front portion of the housing, the peripheral wall is composed of a front side wall portion, a rear side wall portion, and left and right side wall portions, the intake port is provided in the rear side wall portion, and the battery mounting portion is provided. The battery-powered power tool according to any one of claims 1 to 5, which is provided on the rear side wall portion.
The housing has a rectangular parallelepiped shape extending in the front-rear direction, and the tool drive unit, the cooling fan, and the motor are arranged in the housing in order from front to rear in the horizontal direction and mounted in the housing. The battery-powered power tool according to any one of claims 1 to 6.
At least a part of the control circuit for controlling the motor is arranged between the motor and the intake port.
The battery-powered power tool according to any one of claims 1 to 7, wherein the housing further includes a guide portion for directing air sucked from the intake port to the at least a part of the control circuit.
Further provided with a motor holding member which is tubular and holds the motor coaxially inside.
The battery-powered power tool according to any one of claims 1 to 8, wherein the air sucked from the intake port is passed through the motor holding member and then directed toward the exhaust port.
The battery-powered power tool according to any one of claims 1 to 9, wherein the exhaust port is provided at a position adjacent to the cooling fan.
The battery-powered power tool according to any one of claims 1 to 10, wherein the battery mounting portion can be mounted so that the battery fits in the height width of the housing.
The battery-powered power tool according to any one of claims 1 to 11, which is attached to the bottom wall of the housing and further includes a fixture for fixing the housing to the workpiece.
The bottom wall has a horizontal portion extending horizontally from the front to the rear and an inclined portion inclined rearward and downward from the rear end of the horizontal portion to the rear end of the housing.
The fixture is attached to the horizontal portion and
The battery-powered power tool according to claim 12, wherein the fixture is provided with a stabilizer that extends rearward to the lower side of the battery mounting portion.
The tool drive portion has a tool mounting portion at the lower end thereof to which a work tool can be detachably attached, and a retracting position where the tool mounting portion is retracted into the housing and the tool mounting portion downward from the housing. The battery-powered power tool according to claim 13, which is displaceable from the extension position.
An inverted U-shaped handle consisting of a pair of legs rotatably attached to the housing about an axis extending horizontally in the left-right direction of the housing and a grip portion extending between the legs. Between a gripping position where the legs extend upward from the axis so that the gripping portion can be gripped by the user and a storage position where the gripping portion is housed in a recess provided in the top wall of the housing. The battery-powered power tool according to any one of claims 1 to 14, further comprising a handle displaceable in.