JP7220279B2 - battery power tools - Google Patents

Description

TECHNICAL FIELD 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 disposed within the housing to cool members disposed within the housing. .

2. Description of the Related Art Conventionally, battery powered tools such as portable jigsaws and drilling machines that are driven by electric power supplied from batteries have been known. In such a battery-powered power tool, in order to cool the heat-generating elements such as the motor and the control circuit inside the tool body, the cooling fan arranged inside the tool body is rotated by the motor so that outside air is blown into the tool body. There is something that is designed to take in. Specifically, heat generating elements such as a motor and a control circuit are placed between the air inlet and the air outlet provided in the tool body, so that the outside air sucked from the air inlet hits these heat generating elements to generate heat. It is designed to cool the body (Patent Document 1).

Japanese Patent No. 4998846

Power tools are generally used in many dusty environments. They are also sometimes used in environments that are wet with water or oil. In particular, in the case of an electric tool such as a jigsaw or a drilling machine that cuts or drills a workpiece, chips of the workpiece are generated. When a power tool having the above-described cooling structure is used in such an environment, dust such as chips, water, oil, etc. scattered around the workpiece together with outside air from the air inlet will cause the tool to cool down. It may be sucked into the main body and cause malfunction of the motor and circuits in the tool main body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery-operated power tool that can prevent such dust from being sucked into the tool body.

That is, the present invention
A housing having a bottom wall facing a workpiece during a machining operation, a top wall located above the bottom wall and facing the bottom wall, and a peripheral wall between the bottom and top walls, the housing exterior within the housing. a housing having an intake port for taking in air from the housing and an exhaust port for discharging air from the housing to the outside of the housing, at least the intake port being provided on the peripheral wall;
a motor mounted within the housing;
a tool drive mounted on the housing and driven by the motor;
It is mounted inside the housing and rotates with the rotation of the motor, sucks air from outside the housing into the housing through the air inlet and discharges it outside the housing through the air outlet, cooling the inside of the housing with the air. a cooling fan that allows
A battery mounting portion provided on the peripheral wall of the housing for detachably mounting a battery for supplying electric power to the motor on an outer surface of the peripheral wall, wherein the battery and the peripheral wall are connected to each other when the battery is installed. An air intake space having an upward opening directed upward is defined between the part where the air intake is provided, and when the cooling fan rotates, the upward opening, the air intake space and the air intake space are defined. a battery mount through which air is drawn into the housing through an air intake;
to provide a battery powered tool having

In this battery-powered power tool, the air sucked into the housing is mainly drawn from above, so it is particularly difficult to cut a horizontally placed workpiece from above. It is possible to suppress the suction into the housing of chips, dust, etc. scattered on the work piece, workbench, etc. around the battery-powered power tool. In addition, by forming such an air intake space using the mounted battery, the shape of the housing can be simplified compared to the case where a similar air intake space is formed in the housing itself. It becomes possible to do. Terms such as "upper", "bottom wall", and "top wall" used herein are used to define relative positional relationships within the housing of the battery powered tool. It is not for specifying an absolute position or direction with respect to the direction of gravity. For example, if the "bottom wall" is positioned above the vertical direction, which is the direction of gravity, then the "top wall" is located below the "bottom wall", and the direction in the battery-powered power tool is based on the vertical direction. direction does not always match.

In the above battery-powered power tool, the battery attachment portion may have a bottom plate extending from the peripheral wall of the housing so as to at least partially cover the bottom surface of the attached battery from below. When cutting a horizontally placed work piece from above, the bottom plate becomes a position that shields the air intake space from the work piece and the workbench that scatter cut pieces, etc., and cut pieces into the housing. It is possible to more reliably suppress such suction.

The battery mounting part has a battery facing part that contacts or approaches the mounted battery at a position below the air inlet to suppress air from flowing into the air intake space from below. can also

The air intake space may have side openings that open in at least one of the left and right directions to allow air to flow into the air intake space. It assists in drawing air into the housing.

Further, when the battery is mounted, the battery mounting portion defines an extended lower space continuing to the air intake space between the peripheral wall and the battery at a position extending downward from the air inlet. can also Considering relatively heavy dust that may be contained in the air that flows into the upward opening, such dust will fall into the extended lower space when the direction is changed and the air is sucked into the air inlet. It is possible to prevent the liquid from being sucked into the housing.

In the battery-operated power tool according to the present invention, the tool driving portion is arranged in the front portion of the housing, the peripheral wall is composed of a front wall portion, a rear wall portion, and left and right side wall portions, and the air inlet is the rear wall portion. It may be provided on the side wall portion, and the battery mounting portion may be provided on the rear side wall portion. By establishing such a positional relationship between the tool drive section and the battery mounting section, it is possible to more effectively attract chips and the like to the housing.

Further, the housing has a rectangular parallelepiped shape extending in the front-rear direction, and the tool driving section, the cooling fan, and the motor are horizontally arranged in order from the front to the rear in the housing and mounted in the housing. You can also make it exist. By doing so, the width of the housing in the vertical direction can be reduced, and the battery-powered power tool can be made low.

In the battery powered tool according to the present invention, at least part of a control circuit for controlling the motor is arranged between the motor and the air inlet, and the housing is configured to hold air drawn from the air inlet. to the at least part of the control circuit. This is to efficiently cool the control circuit that generates heat.

The battery-operated power tool according to the present invention further includes a cylindrical motor holding member that coaxially holds the motor inside, and air sucked from the air inlet passes through the motor holding member. It can be made to go to the exhaust port after it is done. This is for forced cooling of the motor.

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

The battery mounting portion can be configured so that the battery can be mounted within the width of the housing in the height direction. This is for the purpose of reducing the height of battery-powered power tools.

The battery-powered power tool according to the present invention may further include a fixture attached to the lower surface of the bottom wall of the housing for fixing the housing to the workpiece. When drilling holes in a workpiece, the battery-powered power tool can be fixed to the workpiece. The fixture can be mechanical or magnetic.

In this case, the bottom wall has a horizontal portion extending horizontally from the front to the rear and an inclined portion extending from the rear end of the horizontal portion to the rear end of the housing while being inclined rearward and downward. Attached to the horizontal portion, the fixture may be provided with a stabilizer that extends rearwardly to the underside of the battery mount. Such a configuration is intended to reduce the height of the battery power tool. The stabilizer prevents the battery-powered power tool from rising from the workpiece due to the recoil when the tool is pressed against the workpiece during operation of the battery-powered power tool. The stabilizer can also protect the battery mounting part when the battery powered power tool is accidentally dropped.

In this case, the tool driving section has a tool mounting section to which the working tool is detachably mounted at its lower end, a retracted position in which the tool mounting section is retracted into the housing, and a retracted position in which the tool mounting section is retracted into the housing. can be displaceable between an extended position extending downward from the .

Further, in the battery-powered power tool according to the present invention, the housing includes a pair of legs attached to the housing so as to be rotatable about an axis extending horizontally in the left-right direction of the housing, and a pair of legs between the legs. an inverted U-shaped handle comprising an extending grip portion in a gripping position where the legs extend upwardly from the axis such that the grip portion is grippable by a user; A handle may be provided that is displaceable between a stowed position and a stowed position stowed in a recess provided in the top wall. It facilitates portability of the battery-powered power tool.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a battery powered tool according to the present invention will be described below with reference to the accompanying drawings.

1 is a side view of a battery powered tool according to one embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; Fig. 2 is a perspective view of the battery powered tool of Fig. 1 with the battery removed;

A battery powered power tool 1 according to an 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, as shown in FIG. 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 part 12 is composed of an electromagnet fixture 20 and a stabilizer 22 extending rearward from the electromagnet fixture 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 holes in a metal workpiece. When drilling, 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 drilling, the annular cutter 16 pressed against the workpiece receives a reaction force from the workpiece, which causes the front portion of the tool body 10 to be lifted upward, but the stabilizer 22 contacts the workpiece. By doing so, it is possible to more reliably prevent floating.

As shown in FIGS. 2 and 3, the tool body 10 includes a housing 24, a motor 26 disposed within the housing 24, a cooling fan 30 attached to a rotating shaft 28 of the motor 26, and driving power for the motor 26. has a battery mounting portion 32 to which the battery 14 that supplies the is mounted. The motor 26 is arranged so that its rotational axis R faces the front-rear direction of the tool body 10 (left-right direction in the drawing), and is coaxially disposed inside the motor holding member 34 extending cylindrically in the front-rear direction within the housing 24 . are kept in shape. A rotating shaft 28 of the motor 26 is drivingly connected to a tool driving section 38 via a reduction gear mechanism 36 . The tool driving portion 38 is a cylindrical member that is rotatable about a vertically extending rotation axis as a whole and displaceable in the vertical direction. A tool mounting portion 40 is provided. The tool drive unit 38 is driven by a feed mechanism 44 comprising a rack 42 provided on the outer surface thereof so as to extend in a vertical direction, and a pinion 41 attached to the rotating shaft of the lever 18 and meshing with the rack 42 . It is designed to move up and down in accordance with the rotation operation. The tool driving portion 38 is displaceable between a retracted position in which the tool mounting portion 40 is retracted into the housing 24 and an extended position in which the tool mounting portion 40 extends downward from the housing 24. . As shown, in the housing 24, a tool drive unit 38, a feed mechanism 44, a reduction gear mechanism 36, a cooling fan 30, and a motor 26 are horizontally arranged in this order from the front to the rear.

The housing 24 as a whole has a rectangular parallelepiped shape elongated in the front-rear direction. The housing has a bottom wall 24-1 that faces the work piece when the fixed part 12 is fixed to the work piece and drilling is performed, and a top wall located above the bottom wall 24-1. 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 consists of a front wall portion 24-4, a rear wall portion 24-5, and left and right side wall portions 24-6 extending between the front wall portion 24-4 and the rear wall portion 24-5. . The housing 24, as shown in FIGS. 3 and 4, has an intake port 46 for sucking outside air into the housing 24 in the rear wall portion 24-5 of the peripheral wall 24-3. As shown in FIGS. 2 and 4, the housing 24 has exhaust ports 48 for exhausting external air sucked from the air intake port 46 in the left and right side wall portions 24-6 of the peripheral wall 24-3. The intake port 46 consists of a plurality of laterally extending slit-shaped holes, and usually a wire mesh filter 50 is attached. A louver 52 extending obliquely upward toward the front is formed inside the housing 24 of the intake port 46 . This louver 52 prevents water from entering from the intake port 46 . The exhaust port 48 is arranged so as to face obliquely 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 a forward position and an inclined portion 24-1b extending rearward and downward from the horizontal portion 24-1a to the rear end of the housing 24. An electromagnet fixture 20 is fixed to the horizontal portion 24-1a, and a stabilizer 22 passes under the inclined portion 24-1b and is positioned under the battery 14. As shown in FIG. By doing so, the battery 14 can be accommodated within the width of the housing 24 in the height direction, so that the electromagnet fixture 20 and the battery 14 can be accommodated compactly 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 power tool 1 . The handle 25 comprises 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. A gripping position where the leg portion 25-1 extends upward and the gripping portion 25-2 can be gripped by the user, and the gripping portion 25-2 is provided on the top wall 24-2 of the housing 24. It can be displaced between a retracted position and a recessed portion 24-7.

Also located within the housing 24 is a control circuit 56 for controlling the motor 26 . The control circuit 56 includes a circuit board 58 arranged in the front-rear direction above the motor 26, an FET (field effect transistor) 60 arranged extending downward from the circuit board 58, and a radiation fin 61 sandwiched between the FETs 60. and A FET 60 and heat radiating fins 61 , which are part of the control circuit 56 , are located between the air intake 46 and the motor 26 . The FET 60 is an electronic component for adjusting the power supplied from the battery 14 to the motor 26, and heats up due to the flow of a relatively large current.

When the motor 26 rotates the cooling fan 30 , outside air is drawn into the housing 24 through the intake port 46 . The sucked air is directed upward by the louver 52 but is directed downward along the wall surface 62 in front thereof. A guide portion 64 inclined downward toward the front is formed below the intake port 46 in the housing 24, and the sucked air is directed to the FET 60 and the radiation fins 61 of the control circuit 56 by the guide portion 64. be guided towards. Air hits the heated FET 60 and the radiation fin 61, and the FET 60 and the radiation fin 61 are cooled. The air that has passed through the FET 60 and the heat radiation fins 61 cools the motor 26 by passing between the stator 66 and the rotor 68 of the motor 26 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 obliquely rearward, the air is exhausted rearward. The battery-powered power tool 1 can efficiently cool the FET 60 and the motor 26 that generate heat during operation by passing outside air through the housing 24 in this way. In addition, by allowing the air to be exhausted rearward from the exhaust port 48, chips generated during the drilling process by the annular cutter 16 are prevented from being blown up by the exhaust.

The battery mounting portion 32 includes a bottom plate 32-1 extending rearward from a bottom wall 24-1 of the housing 24 so as to cover the bottom surface of the battery 14 from below, and a rearward extension from left and right side wall portions 24-6 of the housing 24. a supporting side portion 32-2 that supports the battery 14 from both sides, a battery facing portion 32-3 that extends vertically between the supporting side portions 32-2 and substantially contacts the mounted battery 14, and the battery A terminal portion 32-4 which is provided at a vertical middle position (FIG. 4) of the facing portion 32-3 and is electrically connected to the connection terminal of the attached battery 14, and a widthwise central position of the battery facing portion 32-3. A locking portion 32-6 having a surface 32-5 extending to the height of the lower end of the intake port 46 so as to be flush with the battery facing portion 32-3. A lock groove 32-7 for receiving a lock portion (not shown) of the battery to lock the battery 14 to the battery mounting portion 32 is provided on the right side of the lock portion 32-6 as viewed in FIG. The intake port 46 is provided above the rear wall portion 24-5 of the housing 24 located forward of the battery facing portion 32-3. An air intake space 74 having an upward opening 74-1 is formed between the battery 14 and the upper half of the rear wall portion 24-5 where the air intake 46 is provided. An extended lower space 76 that continues to the air intake space 74 is formed between the battery 14 and the rear wall portion 24-5 at a position continuing downward. In the illustrated example, the extended lower spaces 76 are provided on both sides of the lock portion 32-6 so as to open sideways. The extended lower space 76 makes it possible to accommodate dust that falls from the outside air that is turned in the air intake space 74 and sucked into the intake port 46 .

In the battery-powered power tool 1, as described above, the air intake space 74 that opens upward is formed between the battery 14 and the air intake 46. Therefore, outside air sucked from the air intake 46 is mainly directed upward. It will be sucked from the bottom and will not be sucked from below. Therefore, it is possible to suppress the attraction of chips and the like scattered around the battery-powered power tool 1 during the drilling operation. In addition, by forming the air intake space 74 using the detachably mounted battery 14, compared to the case where the air intake space 74 is formed only by the housing 24, It is possible to simplify the shape of the housing 24 . In this embodiment, the air intake space 74 has side openings 74-2 that open to the left and right to allow air to flow into the air intake space 74. As shown in FIG.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, in the above embodiment, the tool driving section is arranged in the front portion of the tool body, and the air intake is arranged in the rear position. can also be The fixture does not use an electromagnet, but may be of another form such as a vacuum suction or a vise, and the fixing portion need not necessarily be provided. Furthermore, for example, a drilling device using a drill as a working tool, or a jigsaw using a saw tooth as a working tool such that the tool mounting portion is driven up and down, other than the drilling machine. It can be used as a tool.

1 Battery-powered electric tool 10 Tool body 12 Fixed part 14 Battery 16 Annular cutter (working tool)
18 Lever 20 Electromagnetic fixture 22 Stabilizer 24 Housing 24-1 Bottom wall 24-1a Horizontal portion 24-1b Inclined portion 24-2 Top wall 24-3 Peripheral wall 24-4 Front wall 24-5 Rear wall 24-6 Side wall portion 24-7 Recessed portion 25 Handle 25-1 Leg portion 25-2 Grip portion 26 Motor 28 Rotating shaft 30 Cooling fan 32 Battery mounting portion 32-1 Bottom plate 32-2 Support side portion 32-3 Battery facing portion 32-4 Terminal Part 32-5 Surface 32-6 Locking part 32-7 Locking groove 34 Motor holding member 36 Reduction gear mechanism 38 Tool driving part 40 Tool mounting part 41 Pinion 42 Rack 44 Feeding 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 Radiation fin 62 Wall surface 64 Guide part 66 Stator 68 Rotor 74 Air intake space 74-1 Upward opening 74-2 Side opening 76 Extended lower space R Rotational axis

Claims (15)

A housing having a bottom wall facing a workpiece during a machining operation, a top wall located above the bottom wall and facing the bottom wall, and a peripheral wall between the bottom and top walls, the housing exterior within the housing. a housing having an intake port for taking in air from the housing and an exhaust port for discharging air from the housing to the outside of the housing, at least the intake port being provided on the peripheral wall;
a motor mounted within the housing;
a tool drive mounted on the housing and driven by the motor;
It is mounted inside the housing and rotates with the rotation of the motor, sucks air from outside the housing into the housing through the air inlet and discharges it outside the housing through the air outlet, cooling the inside of the housing with the air. a cooling fan that allows
A battery mounting portion provided on the peripheral wall of the housing for detachably mounting a battery for supplying electric power to the motor on an outer surface of the peripheral wall, wherein the battery and the peripheral wall are connected to each other when the battery is installed. An air intake is provided to define an air intake space having an upward opening directed upward between a portion facing the battery , and when the cooling fan rotates, the upward opening, the air a battery mounting portion that allows air to be drawn into the housing through the intake space and the air inlet;
A battery-operated power tool having a 2. The battery powered tool of claim 1, wherein the battery mounting portion has a bottom plate extending from the peripheral wall of the housing so as to at least partially cover the bottom surface of the mounted battery from below. The battery mounting portion has a battery facing portion that contacts or is close to the mounted battery at a position below the intake port to suppress air from flowing into the air intake space from below. 3. The battery powered power tool according to 1 or 2. 4. The air intake space according to any one of claims 1 to 3, wherein the air intake space has a side opening that opens in at least one of the right and left directions to allow air to flow into the air intake space. battery power tools. When the battery is mounted on the battery mounting portion, an extended lower space continuing to the air intake space is defined between the peripheral wall and the battery at a position extending downward from the air inlet. 5. A battery powered power tool according to any one of claims 1-4. The tool driving portion is disposed in the front portion of the housing, the peripheral wall is composed of a front wall portion, a rear wall portion, and left and right side walls, the air intake is provided in the rear wall portion, and the battery mounting portion is 6. A battery powered power tool according to any one of the preceding claims, provided on the rear wall portion. The housing has a rectangular parallelepiped shape extending in the front-rear direction, and the tool driving section, the cooling fan, and the motor are horizontally arranged in order from the front to the rear in the housing and mounted in the housing. A battery powered tool according to any one of claims 1-6. at least a portion of a control circuit for controlling the motor is disposed between the motor and the air intake;
8. The battery powered tool of any one of claims 1-7, wherein the housing further comprises a guide portion for directing air drawn from the air inlet to the at least part of the control circuit. further comprising a cylindrical motor holding member for coaxially holding the motor inside,
9. The battery powered tool according to any one of claims 1 to 8, wherein air sucked from the air inlet is directed through the motor holding member and then toward the air outlet. 10. The battery powered tool of any one of claims 1-9, wherein the air outlet is located adjacent to the cooling fan. The battery-operated power tool according to any one of claims 1 to 10, wherein the battery mounting portion can be mounted so that the battery fits within the width of the housing in the height direction. 12. The battery powered tool of any one of claims 1-11, further comprising a fixture attached to the bottom wall of the housing for securing the housing to a workpiece. The bottom wall has a horizontal portion extending horizontally from the front to the rear, and an inclined portion extending from the rear end of the horizontal portion to the rear end of the housing, sloping backward and downward,
the fixture is attached to the horizontal portion;
13. The battery powered tool of claim 12, wherein the fixture is provided with a stabilizer that extends rearwardly to reach below the battery mounting portion. The tool driving section has a tool mounting section to which a working tool is detachably mounted at its lower end, and has a retracted position in which the tool mounting section is retracted into the housing and a retracted position in which the tool mounting section extends downward from the housing. 14. The battery powered tool of claim 13 displaceable between an extended extended position. An inverted U-shaped handle comprising a pair of legs rotatably attached to the housing about an axis extending horizontally in the lateral direction of the housing, and a grip extending between the legs, Between a grasping position where the legs extend upward from the axis and the grasping portion can be grasped by a user, and a retracted position where the grasping portion is housed in a recess provided in the top wall of the housing. 15. A battery powered tool according to any one of the preceding claims, further comprising a handle displaceable at .

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