JP6397594B2 - Impact driver, driver drill, power tool - Google Patents

Description

  The present invention relates to an impact driver, a driver drill, and an electric tool that drive a motor using a battery pack as a power source.

  As a power tool, there is known a so-called DC tool that drives a motor using a battery pack mounted on a housing as a power source to operate an output unit. As disclosed in Non-Patent Document 1, such a DC tool includes a motor corresponding to a battery pack having a predetermined rated voltage.

“Makita General Catalog 2016-4”, [online], pp. 8-12, [Search April 21, 2016], Internet <URL: http://ecatalog.makita.co.jp/flash/administrator/ 20 / # 12>

  When the rated voltage of the battery pack is increased (for example, 18V) in order to obtain large power, the size of the motor (outer diameter of the stator) is increased accordingly, leading to an increase in the size of the housing that accommodates the motor. For this reason, handling in a narrow work location becomes difficult.

  Therefore, an object of the present invention is to provide an impact driver, a driver drill, and an electric tool that can be kept compact and are excellent in usability.

To achieve the above object, a first aspect of the present invention provides a brushless motor including a stator and a rotor, a motor housing that houses the brushless motor, a grip portion provided below the motor housing, An impact driver comprising a battery mounting portion provided below and one battery pack with a rated voltage of 36 V mounted on the battery mounting portion,
Of the brushless motor stator has the same outer diameter as the first brushless motor stator having a first coil used in other power tools that are used at the rated voltage 18V, the brushless motor stator, other electric A first stator that is used at a rated voltage of 18V and has a first coil, and a second coil that is used at a rated voltage of 36V and is thinner than the first coil in another power tool. And a second stator having a larger outer diameter than the first stator, and a first stator selected from a series of stators including a second coil.
In order to achieve the above object, a second aspect of the present invention provides a brushless motor including a stator and a rotor, a motor housing that houses the brushless motor, a grip portion provided below the motor housing, A driver drill comprising a battery mounting portion provided below and one battery pack with a rated voltage of 36 V mounted on the battery mounting portion,
Of the brushless motor stator has the same outer diameter as the first brushless motor stator having a first coil used in other power tools that are used at the rated voltage 18V, the brushless motor stator, other electric A first stator that is used at a rated voltage of 18V and has a first coil, and a second coil that is used at a rated voltage of 36V and is thinner than the first coil in another power tool. And a second stator having a larger outer diameter than the first stator, and a first stator selected from a series of stators including a second coil.
In order to achieve the above object, the invention according to claim 3 is an electric tool that can use one battery pack having a rated voltage of 36V,
A built-in motor is used in another electric tool at a rated voltage of 18V and has a first coil, and the other electric tool is used at a rated voltage of 36V and is thinner than the first coil. A first stator selected from a series of stators including a second stator having a second coil having a diameter and a larger outer diameter than the first stator, and a second coil. And

  According to the present invention, it is possible to use an impact driver, a driver drill, and a power tool having a compact housing diameter for housing a motor, which is excellent in usability.

It is a side view of an impact driver. It is a front view of an impact driver. It is an enlarged plan view of an impact driver. It is a center longitudinal cross-sectional view of an impact driver. It is an AA line expanded sectional view of FIG. It is an enlarged view of the screw boss portion on the upper side of the brushless motor. It is explanatory drawing of the state which placed the impact driver horizontally. It is explanatory drawing which compares the largest cross-sectional area of a main-body part and a battery pack, (A) shows a main-body part and (B) shows the largest cross section of a battery pack, respectively. It is a side view of the impact driver which attached the battery pack from which rated capacity differs. It is a side view of the impact driver which shows the example of a change of a display part. It is a front view (partial cross section) of the impact driver which shows the example of a change of a display part. It is a side view of the impact driver which shows the example of a change of a main-body part. It is a front view of the impact driver which shows the example of a change of a main-body part. It is a center longitudinal cross-sectional view of the impact driver which shows the example of a change which inclined the main-body part. It is a front view of the impact driver which shows the example of a change which inclined the main-body part. It is a center longitudinal cross-sectional view of a driver drill. It is a front view of a driver drill. It is explanatory drawing of the system which uses a DC pack and uses a battery pack separately. It is explanatory drawing of the system which uses a DC tool properly by sharing a battery pack. It is explanatory drawing of the set of two types of DC tools and a battery pack.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a side view of an impact driver as an example of an electric tool, FIG. 2 is a front view, FIG. 3 is an enlarged plan view, FIG. 4 is a central longitudinal sectional view, and FIG. 5 is an enlarged sectional view taken along line AA in FIG. It is.
The impact driver 1 has a main body portion 2 having a central axis in the front-rear direction and a grip portion 3 protruding downward from the main body portion 2, and the battery mounting portion 4 provided at the lower end of the grip portion 3 includes a power source. The battery pack 5 is mounted. A switch 6 with a trigger 7 protruding forward is accommodated in the upper part of the grip part 3, and a motor forward / reverse switching lever 8 is provided on the upper side of the switch 6. The battery mounting portion 4 is provided with a terminal block 9 having a terminal plate 10 and a controller 11 having a control circuit board 12 on which a microcomputer, a switching element and the like are mounted. Further, on the upper surface of the battery mounting portion 4, there are provided a button switch 14 as an operation portion for switching operation of torque and striking force, and a display portion 15 for displaying the current torque and striking force and the remaining capacity of the battery pack 5. A switch panel 13 is provided.

  The battery pack 5 includes terminals (not shown) that are electrically connected to the terminal plate 10 of the terminal block 9 on the upper surface of a box-shaped case 16 that accommodates a plurality of cells (here, lithium ion batteries), and on both the left and right sides. The battery mounting portion 4 includes a pair of rail portions 18 and 18 fitted between the guide portions 17 and 17 provided on both the left and right sides. Reference numeral 19 denotes a hook that is urged upward from the case 16 and engages with a recess 20 provided on the front lower surface of the battery mounting portion 4 to prevent the battery mounting portion 4 from coming into the case 16 by a button 21 provided on the front surface of the case 16. The battery pack 5 can be removed by the pushing operation. The battery pack 5 has a rated voltage of 18V.

  The main body 2 accommodates the brushless motor 22 and the hammer case 23 in this order from the rear. Inside the hammer case 23, a planetary gear reduction mechanism 24 that reduces the rotation of the rotation shaft 46 of the brushless motor 22, a spindle 25 that rotates at a reduced speed by the planetary gear reduction mechanism 24, and a striking operation is added to the rotation of the spindle 25. A striking mechanism 26 and an anvil 27 serving as a final output shaft are provided inside, and the anvil 27 projects forward from the front end of the main body 2. The hammer case 23 including the anvil 27 serves as an output unit. A bit insertion hole 28 and a sleeve 29 for attaching / detaching the inserted bit are provided at the tip of the anvil 27, and a rubber bumper 30 is attached to the front of the hammer case 23 behind the sleeve 29. Has been.

  The rear half of the main body 2 has a cylindrical motor housing 31 that houses the brushless motor 22 and is integrated with the grip 3. The motor housing 31 and the grip 3 are half of the motor housing 31. And a half of the grip portion 3 are formed by assembling a pair of left and right half housings HR, HL integrally formed by a plurality of screws 32, 32. The rear end of the motor housing 31 is closed by forming exhaust ports 33, 33... On the side surface, and intake ports 34, 34... Are formed on the side surface of the motor housing 31 in front of the exhaust port 33. ing.

  In addition, in the half housings HR and HL, among the screw bosses for screwing, as shown in FIG. 6, the screw boss 35 located on the upper side of the brushless motor 22 has a chamfered portion 36 formed on the lower surface thereof. Along with the upper part of the minute motor housing 31, it can be arranged below (close to the brushless motor 22). Further, on the surfaces of the half housings HR, HL, the side surface of the motor housing 31, the side surface of the grip portion 3, and the side surface of the battery mounting portion 4 are protected by integrally formed elastomers 37, 37,.

The brushless motor 22 is an inner rotor type having a stator 38 and a rotor 39. First, the stator 38 includes a stator core 40 formed by laminating a plurality of steel plates, a front insulating member 41 and a rear insulating member 42 provided before and after the stator core 40, and a front insulating member 41 and a rear insulating member 42. And a plurality of coils 43, 43,... Wound around the stator core 40, and a sensor circuit board 44 mounted on the front insulating member 41 and having rotation detection elements 45, 45,. Yes.
The outer diameter of the stator 38 is 38 mm, which is the same as that of a brushless motor for a power tool used at a rated voltage of 10.8V, but the coil 43 has a thin wire diameter and a number of turns corresponding to the rated voltage of 18V. Have a lot. In combination with the outer diameter of the stator 38 and the shape of the screw boss 35, the maximum diameter of the motor housing 31 including the elastomer 37 is suppressed to 55 mm.

  The rotor 39 includes a rotation shaft 46 positioned at the shaft center, a cylindrical rotor core 47 disposed around the rotation shaft 46, and permanent magnets 48, 48... Held in the rotor core 47. Have. A pinion 49 is attached to the front end of the rotary shaft 46, and a bearing 50 is assembled to the rear thereof. A centrifugal fan 51 is attached to the rear end of the rotary shaft 46 inside the exhaust ports 33, 33,. A bearing 52 is assembled on the rear side. The bearing 52 is held on the rear inner surface of the motor housing 31. The front end of the rotating shaft 46 protrudes forward through the bearing retainer 53 held by the motor housing 31 in front of the brushless motor 22, and the bearing 50 is held by the bearing retainer 53.

  The bearing retainer 53 is in the shape of a metal disk, and the movement in the front-rear direction is restricted by the locking rib 54 provided on the inner surface of the motor housing 31 being locked to the constricted portion formed in the center. It is held by the motor housing 31. A ring wall 55 having a male threaded portion formed on the outer periphery protrudes forward from the front peripheral edge of the bearing retainer 53, and the ring wall 55 is screwed into the rear end of the hammer case 23 so that the rear portion of the hammer case 23 is formed. Is blocked. The hammer case 23 is a metal cylindrical body having a tapered front half, and a front cylindrical portion 56 is formed at the front end, and is engaged with the inner surface of the motor housing 31 to be prevented from rotating.

The rear end of the spindle 25 is pivotally supported through a bearing 57 at the front portion of the bearing retainer 53. The spindle 25 has a hollow and disk-shaped carrier portion 58 at the rear portion, and a pinion 49 of the rotating shaft 46 projects into a bottomed hole 59 formed in the axial center from the rear surface.
The planetary gear reduction mechanism 24 includes an internal gear 60 having internal teeth and three planetary gears 61, 61... Having external teeth meshing with the internal gear 60. The internal gear 60 has a large-diameter portion 62 on the outer peripheral side of the front portion. The large-diameter portion 62 engages with the inner peripheral surface of the hammer case 23 and is prevented from rotating, and the ring wall 55 and the hammer case 23. The movement in the axial direction is restricted with respect to the stepped portion 63 provided on the inner circumference. The planetary gear 61 is rotatably supported in the carrier portion 58 by a pin 64 and meshes with the pinion 49.

The striking mechanism 26 includes a hammer 65 mounted on the spindle 25 and a coil spring 66 that urges the hammer 65 forward. First, the hammer 65 has a pair of claws 67 and 67 on the front surface, and balls 68 and 68 are fitted over the outer cam groove formed on the inner surface and the inner cam groove formed on the surface of the spindle 25. It is connected to the spindle 25 via A ring-shaped groove 69 is formed on the rear surface of the hammer 65, and the front end of the coil spring 66 is inserted therein. The rear end of the coil spring 66 is received by the front surface of the carrier portion 58.
The anvil 27 is pivotally supported by a bearing 70 held by the front cylindrical portion 56 of the hammer case 23, and a pair of arms 71 and 71 that engage with claws 67 and 67 of the hammer 65 in the rotational direction are provided at the rear end. Is formed. On the rear surface of the bearing 70, a ridge 72 that protrudes beyond the rear surface of the front cylindrical portion 56 and is close to the arm 71 is provided, and a resin washer 73 that receives the arm 71 is fitted to the outside of the ridge 72. ing. A fitting hole 74 is formed in the front axis of the spindle 25, and the rear end of the anvil 27 is inserted coaxially therewith.

  An extended portion 75 extending from the half housings HR and HL and partially covering the lower surface of the hammer case 23 is formed between the trigger case 7 below the hammer case 23. An LED substrate 76 having LEDs 77 is accommodated in the extended portion 75 in a posture in which the LEDs 77 are directed obliquely upward. A lens 78 is provided in front of the LED 77 and is exposed from a window 79 provided on the front surface of the extending portion 75. Therefore, the light when the LED 77 is turned on is irradiated to the front of the anvil 27 through the lens 78.

In the impact driver 1 configured as described above, when the battery pack 5 is slid from the front of the battery mounting portion 4 with the rail portion 18 fitted between the guide portions 17 and 17, each terminal on the upper surface is While being electrically connected to the terminal board 10 provided in the terminal block 9, the hook 19 engages with the recessed part 20 and is attached in a retaining state.
In this mounted state, as shown in FIGS. 2 and 3, both sides of the battery pack 5 having a lateral width larger than the motor housing 31 protrude from both sides of the motor housing 31 in plan view. At this time, the ratio W _M / W _B of the maximum width W _M of the motor housing 31 including the elastomer 37 and the maximum width W _B of the battery pack 5 is about 0.73.

By thus greater maximum width W _B of the battery pack 5, when placed sideways impact driver 1 in the flat ground surface S as shown in FIG. 7, the forward and reverse switching lever 8 protrudes to the ground surface S side Even if it is in the switching position, it does not contact the ground contact surface S. That is, accidental switching of the forward / reverse switching lever 8 is prevented because the maximum slide position of the forward / reverse switching lever 8 is on the inner side of the ground contact surface S when placed horizontally.

Further, as shown in FIG. 2, the width W _S of the switch panel 13 is smaller than the maximum width W _M of the motor housing 31 located directly above. Thus, by making the left and right width of the switch panel 13 smaller than the left and right width of the motor housing 31, the fallen object from the upper side (or the obstacle located on the upper side when the impact driver 1 is lifted upward) It hits the motor housing 31 of the main body 2 and is less likely to hit the switch panel 13 and the display 15. In particular, the display unit 15, since so not visible from directly above is disposed within the maximum width W _M of the motor housing 31 in a plan view as shown in FIGS. 3 and 5, the display unit 15 also falling object Effectively protected from.

Furthermore, the distance D from the axis L of the rotating shaft 46 of the brushless motor 22 shown in FIG. 4 (the axis of the motor housing 31) L to the maximum height position of the main body 2 including the elastomer 37 is 27 mm.
The center of gravity of the entire impact driver 1 is located within a circle G shown in FIG. The position of the center of gravity is within the range of the bottom surface of the battery pack 5 in plan view and is within the grip portion 3.
In addition, as shown in FIG. 8, the maximum cross-sectional area A _B of the battery pack 5 in the horizontal cross section (FIG. 8B) and the maximum cross-sectional area of the main body 2 including the motor housing 31 in the horizontal cross-section ( here, in a horizontal cross-sectional area passing through the axis L of the rotary shaft 46) a H _(FIG. (a)), the direction of maximum cross-sectional area a _B of the battery pack 5 is larger.

  In the impact driver 1, when the trigger 7 is pushed in and the switch 6 is turned on, the brushless motor 22 is supplied with power and the rotating shaft 46 rotates. That is, the control circuit board 12 of the controller 11 obtains the rotation detection signal indicating the position of the permanent magnet 48 of the rotor 39 output from the rotation detection element 45 of the sensor circuit board 44 and obtains the rotation state of the rotor 39 to obtain The rotor 39 is rotated together with the rotating shaft 46 by controlling ON / OFF of each switching element according to the rotated state, and passing current to each coil 43 of the stator 8 in order.

Then, the planetary gear 61 that meshes with the pinion 49 revolves within the internal gear 60 and decelerates and rotates the spindle 25 via the carrier portion 58. Therefore, the hammer 65 is also rotated to rotate the anvil 27 via the arm 71 with which the claw 67 is engaged, thereby enabling screw tightening with a bit. When the screw tightening progresses and the torque of the anvil 27 increases, the hammer 65 moves backward along the inner cam groove of the spindle 25 against the urging force of the coil spring 66, and the claw 67 moves to the arm 71. When separated from, the hammer 65 rotates forward by the biasing force of the coil spring 66 and the guide of the inner cam groove to reengage the claw 67 with the arm 71 and generate a rotating impact force (impact) on the anvil 27. . By repeating this, further tightening is possible.
On the other hand, when the centrifugal fan 51 rotates with the rotation of the rotating shaft 46, the air taken in from the front intake port 34 passes through the brushless motor 22 and cools, and then is discharged from the rear exhaust port 33.

Thus, according to the impact driver 1 of the above embodiment, the maximum width W _M of the motor housing 31, by the ratio of the maximum width W _B of the battery pack 5 is set to be 0.73, rated voltage 18V Even if the battery pack 5 is used, the compactness can be maintained, and the battery pack 5 is easy to use.
However, this W _M / W _B is not limited to 0.73, and if it is up to about 0.75, it is possible to make it compact and prevent accidental switching of the forward / reverse switching lever 8, so that it is less than 0.75. Is desirable.

Similarly, since the outer diameter of the stator 38 of the brushless motor 22 is 38 mm and the outer diameter of the motor housing 31 is 55 mm, even if the battery pack 5 having a rated voltage of 18 V is used, the motor housing 31 is reduced in the radial direction. It will be easy to use.
However, the outer diameter of the stator 38 is not limited to 38 mm, and if it is 40 mm or less, the motor housing 31 can be made compact.

Further, since the motor housing 31 has a cylindrical shape in which the axis L extends in the front-rear direction, and the distance D from the axis L to the maximum height position of the motor housing 31 is 27 mm, the battery pack 5 having a rated voltage of 18V can be used. This leads to the compactness of the motor housing 31 in the height direction, and makes it easy to use even in narrow spaces.
However, since the smaller the distance D is, the smaller the distance is. Therefore, if the thickness of the motor housing 31 can be reduced, it can be made smaller than 27 mm.
In particular, here, since the chamfered portion 36 is formed on the lower surface of the screw boss 35 for assembling the half housings HR and HL on the upper side of the brushless motor 31, the distance D can be easily shortened. The distance D can also be shortened by enlarging the chamfered portion 36 or moving the screw boss 35 toward the upper side.

Since the center of gravity of the entire tool with the battery pack 5 attached is positioned in the bottom surface of the battery pack 5 and in the grip portion 3 in plan view, the balance is good and the structure is not easily collapsed. .
Further, the maximum cross-sectional area A _H of the main body portion 2 which includes a motor housing 31 in the horizontal direction, the direction of maximum cross-sectional area A _B of the battery pack 5 in the horizontal direction is larger, located below the center of gravity As a result, the whole is stable, and the feeling of balance when gripping the grip portion 3 is improved.

As shown in FIG. 9, the battery pack 5A has a small vertical height in the battery pack 5A having a small number of cells and a small rated capacity even at the same rated voltage. However, since the maximum width and the maximum cross-sectional area does not change, the maximum of the relationship between the maximum width W _B of the maximum width W _M and the battery pack 5A of the motor housing 31 and the maximum cross-sectional area A _H and battery pack 5A of the main body portion 2 The relationship between the cross-sectional area _AB and the distance D between the axis L of the main body 2 and the maximum height position are the same as in the above embodiment. However, the center of gravity (circle G) is slightly higher than FIG.

Further, the remaining capacity display section is not limited to being provided on the switch panel as in the above embodiment, but may be provided separately from the switch panel. FIGS. 10 and 11 show an example. The display portion 15A is accommodated in the lower part of the motor housing 31 in the left-right direction to the rear of the forward / reverse switching lever 8, and has four scales arranged in the front-rear direction at both ends. The lighting parts 81 and 81 are provided. The lighting portions 81 and 81 are exposed from the left and right side windows 80 and 80 provided in the motor housing 31, and the remaining capacity is displayed by the number of lit scales in the lighting portion 81. Width in this case is also the display unit 15A is accommodated within the maximum width W _H of the motor housing 31.

Furthermore, as shown in FIGS. 12 and 13, even if the impact driver 1A has a main body 2A having a short length in the front-rear direction, the 18V battery pack 5 (5A) can be used for a 10.8V brushless motor. It is. In the main body 2 </ b> A, the motor housing 31 has a short cylindrical shape in the front and rear, the rear end thereof is closed by a rear cover 82 having an exhaust port 33, and a resin cover 83 on the outside of the hammer case 23 with the bumper 30. Is provided. Again, the maximum cross-sectional area A of the relationship between the maximum width _{W B} of the maximum width _{W M} and the battery pack 5 of the motor housing 31 (5A) and a maximum cross-sectional area _{A H} and battery pack 5 of the main body portion 2 (5A) relationship is _B, the relationship between the distance D, the maximum width W _M of the width W _S and the motor housing 31 of the switch panel 13 between the axis L and the maximum height position of the main body portion 2 is the same as the above-described embodiment .

On the other hand, like the impact driver 1 </ b> B shown in FIGS. 14 and 15, the main body 2 is inclined so that the axis L <b> 1 is downward at a predetermined angle with respect to the longitudinal axis L parallel to the bottom surface of the battery pack 5. You can also By tilting in this way, the force that pushes the entire tool from the grip portion 3 during the downward work is transmitted to the bit without loss, and the work can be performed easily. When the battery pack 5 side is heavy at the time of the downward work, an urging force (rotational force) is exerted to tilt upward on the main body part 2 with the grip part 3 as the center, but this is because the axis L1 is inclined downward. Correct inclination can be corrected. In the case of FIGS. 14 and 15, the relationship between the maximum width _{W B} of the maximum width _{W M} and the battery pack 5 of the motor housing 31 (5A) and a maximum cross-sectional area _{A H} and battery pack 5 of the main body 2 of the (5A) maximum relationship between the cross-sectional area a _B, the relationship of the distance D, the maximum width W _M of the width W _S and the motor housing 31 of the switch panel 13 between the axis L1 and the maximum height position of the body 2, the form Is the same.

And this invention is applicable not only to an impact driver but another electric tool. 16 and 17 exemplify the driver drill 90, the same components as those of the impact driver 1 are denoted by the same reference numerals, and redundant description is omitted.
In the main body portion 2 of the driver drill 90, a gear assembly 91 including a speed reduction / transmission mechanism 92, a clutch mechanism 93, and the like is provided in front of the brushless motor 22. A torque adjusting ring 94 for switching between the drill mode and adjusting the torque in the driver mode is provided. A drill chuck 96 is provided at the tip of the spindle 95 protruding forward from the gear assembly 91.

  Again, the outer diameter of the stator 38 of the brushless motor 22 is 38 mm, which is the same as the brushless motor for a power tool used at a rated voltage of 10.8V. The diameter is narrow and the number of turns is increased. In combination with the outer diameter of the stator 38 and the shape of the screw boss 35, the maximum diameter of the motor housing 31 is suppressed to 55 mm. Further, the outer diameter of the drill chuck 96 is larger than the outer diameter of the stator 38.

  Further, the stator 38 here is shortened in the axial direction by reducing the number of laminated steel plates of the stator core 40, and the grip portion 3 is also positioned in front of the main body portion 2. Accordingly, the LED 77 together with the extending portion 75 is located on the front half side below the torque adjustment ring 94 and is close to the rear end surface of the drill chuck 96. Therefore, LED77 which is a light becomes close to the work location ahead of drill chuck 96, and can irradiate brighter. Further, since the grip portion 3 is positioned on the front side of the main body portion 2, the main body portion 2 can be stably supported and is easy to use.

Also in the driver drill 90, the relationship between the maximum width _{W B} of the maximum width _{W M} and the battery pack 5 of the motor housing 31 (5A) and a maximum cross-sectional area _{A H} and battery pack 5 of the main body portion 2 (5A) The relationship between the maximum cross sectional area _AB and the distance D between the axis L of the main body 2 and the maximum height position is the same as in the above embodiment.
Further, the light may be under the chuck as long as it is in front of the front half of the operation ring.

  The present invention is not limited to the T-type DC tool in which the motor housing is formed in the front-rear direction and the battery pack is attached to the lower end of the grip portion, such as the impact driver and the driver drill of the above-described form. It can also be applied to other DC tools such as multi-tool, jigsaw, hammer drill, etc. in which the battery pack is mounted on the handle side and formed in the left-right direction, and the battery pack is mounted on the rear end of the motor housing in the front-rear direction. is there. The motor is not limited to brushless.

  Moreover, although the case where only an 18V battery pack is used for a DC tool having a 10.8V motor has been described in the above embodiment, as shown in FIG. Select the 10.8V battery pack B1 and the 18V battery pack B2 by interposing an adapter between the DC tool T and the battery mounting part or replacing the unitized controller ( A system that can be used by replacing the two types of battery packs B1 and B2 having different rated voltages with a common DC tool T is also conceivable. It is possible to use three or more types of battery packs.

  On the other hand, as shown in FIG. 19, the DC tool T1 having the motor M1 for 10.8V and the stator outer diameter for 18V having a small diameter (for example, 44 mm) with respect to the battery pack B of 10.8V or 18V. A DC tool T2 having a motor M2 and a DC tool T3 having a motor M3 having a large stator outer diameter (for example, 52 mm) for 18V can be selected and used. A system that selectively uses the types of DC tools T1 to T3 is also conceivable. It is also possible to use two or more types of DC tools. In the case of the two types, as shown in FIG. 20, a DC tool T1 having a motor M1 for 10.8V, a DC tool T2 having a motor M2 for 18V, and 18V used for each tool T1, T2. It is good also as a set with battery packs B and B (one battery pack B may be sufficient).

Also, the rated voltage when setting such a DC tool set (combination) is selected by changing the thickness of the steel plates of the stator core of the stator as described in the driver drills of FIGS. Can do. That is, a first power tool that can be used with a first battery pack having a first rated voltage (for example, 10.8 V) using a steel plate as a first lamination thickness, and a steel plate with a first lamination thickness. A combination with a second power tool that can be used with a second battery pack having a second rated voltage (for example, 18V) as a different second laminated thickness is also possible.
Similarly, the rated voltage can also be selected by changing the wire diameter of the stator coil. That is, a first electric tool that can be used with a first battery pack having a first rated voltage (for example, 10.8 V) using the first coil for the stator, and the first coil for the stator A combination with a second power tool that can be used by mounting a second battery pack having a second rated voltage (for example, 18V) using a second coil having a different wire diameter from the other is also possible.

  And in the said form, although demonstrated using the motor and battery pack between 10.8V-18V, voltage is not restricted to this, For example, 18V-36V, 18V-54V, 36V-72V, etc. It can also be used at other voltages. Note that 10.8V may be referred to as 12Vmax, and 18V may be referred to as 20Vmax.

1, 1A, 1B ... Impact driver 2, 2A ... Body part 3, ... Grip part 4, ... Battery mounting part 5, 5A ... Battery pack, 8 ... Forward / reverse switching lever, 9 ... Terminal block, 11 ... Controller, 12 ... Control circuit board, 13 ... Switch panel, 14 ... Button switch, 15, 15A ... Display, 16 ... Case, 22 ... Brushless motor, 23 ... Hammer Case, 24 ... Planetary gear reduction mechanism, 25 ... Spindle, 26 ... Strike mechanism, 27 ... Anvil, 31 ... Motor housing, 35 ... Screw boss, 36 ... Chamfer, 38 ... Stator, 39 ..Rotor, 46 ..Rotating shaft, 65 ..Hammer, 66 ..Coil spring, 75 ..Extension part, 77 ..LED, 90 ..Driver drill, 91 ..Gear assembly, 94. Click adjustment ring, 95 ... spindle, 96 ... drill chuck, HR ... right half housing, HL ... left half housings, S ... contact surface, _{W M} ... motor maximum width of the housing, W _B ··· The maximum width of the battery pack, W _S ··· The width of the switch panel, A _H ··· The maximum cross-sectional area of the main body, A _B ··· The maximum cross-sectional area of the battery pack

Claims (3)

A brushless motor comprising a stator and a rotor;
A motor housing that houses the brushless motor;
A grip portion provided below the motor housing;
A battery mounting portion provided below the grip portion;
An impact driver comprising: a battery pack having a rated voltage of 36 V mounted on the battery mounting portion;
The stator of the brushless motor is
A first stator that has a first coil and is used in another power tool at a rated voltage of 18V, and a second stator that is used in another power tool at a rated voltage of 36V and has a smaller wire diameter than the first coil. A first stator selected from a series of stators including a second stator having a coil and a larger outer diameter than the first stator, the first stator having the second coil. Impact driver. A brushless motor comprising a stator and a rotor;
A motor housing that houses the brushless motor;
A grip portion provided below the motor housing;
A battery mounting portion provided below the grip portion;
A battery pack having a rated voltage of 36V to be mounted on the battery mounting portion,
The stator of the brushless motor is
A first stator that has a first coil and is used in another power tool at a rated voltage of 18V, and a second stator that is used in another power tool at a rated voltage of 36V and has a smaller wire diameter than the first coil. A first stator selected from a series of stators including a second stator having a coil and a larger outer diameter than the first stator, the first stator having the second coil. Driver drill. An electric tool that can use one battery pack with a rated voltage of 36V,
Built-in motor
A first stator that has a first coil and is used in another power tool at a rated voltage of 18V, and a second stator that is used in another power tool at a rated voltage of 36V and has a smaller wire diameter than the first coil. A first stator selected from a series of stators including a second stator having a coil and an outer diameter greater than that of the first stator; and the second coil. Electric tool.

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