JP2022018201A - Electric tool - Google Patents

Abstract

To provide an electric tool which enables improvement of waterproofness.SOLUTION: An electric tool 1 includes: a tip tool 9; a motor 3; battery cells 26; and a housing 2. The housing 2 includes: a body part 2a which houses the motor 3; a handle part 2 connected at one end with the body part 2a; and a battery cell housing part 2c connected to the other end of the handle part 2b. One end of the battery cell housing part 2c is connected to the handle part 2b. A waterproof charging connector 30 electrically connected to the battery cells 26 is disposed at a rear end part of the battery cell housing part 2c so as to be exposable to the outside of the housing 2. The waterproof charging connector 30 is covered with a lid 40 in an openable and closable manner.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power tool such as an impact driver.

The following Patent Document 1 discloses that the periphery of the wind window is covered with a cover in order to improve the waterproofness of the tool.

Japanese Unexamined Patent Publication No. 2017-226025

In the configuration of Patent Document 1, water may enter from the attachment / detachment portion of the battery or the wind window provided in the battery or the tool body, and further improvement in waterproofness is required.

The present invention has been made in recognition of such a situation, and an object of the present invention is to provide a power tool capable of improving waterproofness.

One embodiment of the present invention is a power tool having a tip tool, a motor, a battery cell, and a housing.
The housing includes a body portion for accommodating the motor, a handle portion having one end connected to the body portion, and a battery cell accommodating portion connected to the other end of the handle portion.
One end of the battery cell accommodating portion is connected to the handle.
A connector portion electrically connected to the battery cell is arranged so as to be exposed on the outside of the housing on any of the battery cell housing portions other than the other end side.
A lid portion that covers the connector portion so as to be openable and closable is provided.

The connector portion may be arranged on the side opposite to the tip tool of the battery cell accommodating portion in a direction parallel to the output shaft of the motor.

The long axis direction of the battery cell may be a direction in which the motor intersects the output axis direction.

In the battery cell accommodating portion, the battery cells are stacked in a bale, and the number of battery cells in the lowermost stage may be larger than the number of battery cells in the uppermost stage.

A substrate may be provided near the upper end of the battery cell accommodating portion.

The housing does not have to have a wind window.

At least a part of the motor may be covered with a resin heat radiating material.

The housing is a split housing.
The connector may be arranged at a place other than the mating surface of the divided housing.

Another aspect of the present invention is a power tool having a tip tool, a motor, a battery cell, and a housing.
The housing is a split housing.
A connector portion electrically connected to the battery cell is arranged at a position other than the mating surface of the split housing.

The connector portion may be fixed to a connector connection portion provided in either of the split housings.

The connector portion may be fixed to a connector connection portion sandwiched by the split housing.

The connector connection portion may be located in the battery cell accommodating portion.

The connector connection portion may be provided on the opposite side of the tip tool.

The split housing may be a left and right split housing.

The housing may be provided with an anti-rotation portion that prevents the connector from rotating.

The connector portion may have a communication terminal.

It should be noted that any combination of the above components and a conversion of the expression of the present invention between methods, systems and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a power tool capable of improving waterproofness.

A side sectional view of the power tool 1 according to the first embodiment of the present invention. The rear view of the lower part of the power tool 1. The lower perspective view which omitted the left housing 2g of the power tool 1. The lower perspective view of the right housing 2f of the power tool 1. FIG. 3 is a perspective view of a combined state of the waterproof charging connector 30, the nut 37, and the lid 40 of the power tool 1. Same side view. Ipsilateral sectional view (AA sectional view of FIG. 5). The perspective view of the state which opened the lid 40 from the state of FIG. Same side view. Ipsilateral cross-sectional view (BB cross-sectional view of FIG. 8). FIG. 10 is a sectional view taken along the line CC of FIG. The circuit block diagram of the power tool 1. Schematic diagram of operation of power tool 1. An exploded perspective view of the power tool 1A according to the second embodiment of the present invention. An exploded perspective view of the power tool 1A seen from a different angle from FIG. The side view of the power tool 1B which concerns on Embodiment 2 of this invention. Side sectional view of the power tool 1B.

In the following, the same or equivalent components, members, etc. shown in the drawings are designated by the same reference numerals, and duplicate description thereof will be omitted as appropriate. The embodiment is not limited to the invention but is an example. Not all features and combinations thereof described in the embodiments are essential to the invention.

(Embodiment 1)
The first embodiment of the present invention will be described with reference to FIGS. 1 to 13. The present embodiment relates to the power tool 1. FIGS. 1 and 2 define the front-back, up-down, and left-right directions of the power tool 1 that are orthogonal to each other. The front-rear direction is a direction parallel to the central axis of the output shaft 3a of the motor 3. The power tool 1 is a cordless type impact driver.

The power tool 1 includes a housing 2. The housing 2 includes a body portion (cylindrical portion) 2a, a handle portion 2b, and a battery cell accommodating portion (battery pack portion) 2c. The body portion 2a has a tubular shape, and its central axis is parallel to the front-rear direction. The handle portion 2b extends downward from the intermediate portion of the body portion 2a. A battery cell accommodating portion 2c is provided at the lower end portion of the handle portion 2b. The upper end (one end) of the battery cell accommodating portion 2c is connected to the handle portion 2b. The lower surface (the other end surface) of the battery cell accommodating portion 2c is a flat surface. The power tool 1 can stand on its own with the lower end surface of the battery cell accommodating portion 2c as a ground plane with respect to the floor surface or the desk surface.

In the body portion 2a, an inverter substrate 17, a motor 3, a deceleration mechanism (rotation transmission mechanism) and a rotation impact mechanism (not shown) are provided in this order from the rear. The inverter board 17 mounts a plurality of switching elements constituting the inverter circuit 60 shown in FIG. The plurality of switching elements are, for example, FETs and IGBTs connected by a three-phase bridge. The inverter board 17 is electrically connected to the control board 20 by the wiring 23. The motor 3 is a brushless motor here. The stator coil of the motor 3 is covered (sealed) with, for example, a heat radiating material 4 made of a resin heat radiating material, and the heat radiating material 4 promotes heat dissipation of the motor 3 and suppresses a temperature rise of the motor 3. As is well known, the rotation of the motor 3 is decelerated by a reduction mechanism (not shown) such as a planetary gear mechanism, transmitted to a rotary impact mechanism (not shown), and the rotary impact mechanism rotates or rotationally impacts the tip tool (bit) 9. The conventional impact driver has a fan in the body portion, but the power tool 1 has a closed structure in which the housing 2 does not have a wind window or the like, and has a fanless structure in which a fan that generates an air flow is not provided.

A trigger 10 is provided at the upper end front portion of the handle portion 2b. The trigger 10 is an operation unit for the operator to switch between driving and stopping the motor 3. The trigger 10 can move (slide) in the front-rear direction with respect to the handle portion 2b according to the operation of the operator. A magnet 16 is provided at the rear of the trigger 10. The magnet 16 is a permanent magnet, and the magnetic pole surface faces rearward. The trigger 10 is urged forward by a spring 11 as an urging means. The sensor board 13 is provided at the upper end portion of the handle portion 2b and behind the trigger 10. The sensor substrate 13 is housed and held in the substrate case 12 so as to be perpendicular to the front-rear direction. The sensor board 13 is electrically connected to the control board 20 by the wiring 22. The sensor substrate 13 and the trigger 10 are separated by a wall portion 2d of the housing 2.

A trigger sensor 15 is provided on the front surface of the sensor board 13. The trigger sensor 15 includes a magnetic sensor for on / off determination and a magnetic sensor for pulling amount measurement. Both of these magnetic sensors are, for example, Hall ICs, and are present at the same positions as the magnet 16 in the vertical direction. The magnetic field strength of the magnet 16 at the position of the trigger sensor 15 changes according to the position in the front-rear direction of the trigger 10. The magnetic sensor for on / off determination is a digital output type, and when the pull amount of the trigger 10 is less than or equal to a predetermined value, a low level signal indicating off is output, and the pull amount (operation amount) of the trigger 10 is set to a predetermined value. If it exceeds, a high level signal indicating ON is output. The magnetic sensor for measuring the pull amount is an analog output type, and outputs a signal whose voltage value increases as the pull amount (operation amount) of the trigger 10 increases.

A plurality of rechargeable battery cells 26 such as a lithium ion secondary battery are housed in the battery cell accommodating portion 2c. As shown in FIG. 3, the plurality of battery cells 26 are stacked in a bale, and the number of battery cells in the lowermost stage is larger than the number of battery cells in the uppermost stage. As a result, the center of gravity of the power tool 1 is lowered, so that the power tool 1 can be stably placed. The plurality of battery cells 26 are held in the battery cell accommodating portion 2c by the separator 27. The axis c shown in FIG. 3 is the central axis of the cylindrical battery cell 26. The central axis of each battery cell 26 is parallel to the left-right direction. The left-right direction is an example of a direction intersecting the output shaft direction of the motor 3. The plurality of battery cells 26 are electrically connected to each other by the tab 28 in a predetermined connection form. In the illustrated example, the number of battery cells 26 is 10, and the connection form of the battery cells 26 is, for example, 10 series connections or 5 series connections in parallel. A series connection of 10 lines is preferable in that the current value is suppressed and heat generation is suppressed as compared with other connection forms in which parallel connections are combined.

The control board 20 is provided at a position above the battery cell 26 in the upper part (near the upper end) in the battery cell accommodating portion 2c. The control board 20 is provided with a calculation unit 50 and the like shown in FIG. The control board 20 is electrically connected to the battery cell 26 by the wiring 25. An operation panel 21 is provided on the upper side surface of the battery cell accommodating portion 2c. The operation panel 21 is an operation unit for an operator to switch the drive mode of the power tool 1 between, for example, a strong (high speed), medium (medium speed), and weak (low speed) mode.

As shown in FIG. 4, a connector mounting hole 2h as a connector connecting portion is provided at the rear end portion of the battery cell accommodating portion 2c. The connector mounting hole 2h is, for example, a circular through hole. As shown in FIG. 2, the housing 2 is a two-divided housing composed of a right housing 2f and a left housing 2g, and has a connector mounting hole 2h in the right housing 2f. As a result, the waterproof charging connector 30 is arranged at a position other than the mating surface of the right housing 2f and the left housing 2g. As shown in FIG. 4, the right housing 2f has a connector mounting hole 2h protruding to the left in the vicinity of the connector mounting hole 2h because the connector mounting hole 2h is located at the center of the rear end portion of the battery cell accommodating portion 2c in the left-right direction. The surface of the rear end surface of the battery cell accommodating portion 2c where the connector mounting hole 2h opens faces diagonally upward rearward.

A waterproof charging connector 30 as a connector portion is provided in the connector mounting hole 2h. The waterproof charging connector 30 is closed (covered) by a lid (cover portion) 40 so as to be openable and closable. When the lid 40 is opened (removed), the connection portion (terminal portion) 34 of the waterproof charging connector 30 is exposed to the outside. A charging plug extending from a charger (not shown) can be connected to the connection portion 34. The connection portion 34 is electrically connected to the control board 20 by the wiring 24. The connection unit 34 may be electrically connected to the battery cell 26 via the control board 20, or may be electrically connected to the battery cell 26 without the control board 20. A charging current is supplied from the charger to the battery cell 26 via the connection portion 34 of the waterproof charging connector 30.

As shown in FIGS. 5 to 10, the waterproof charging connector 30 has a flange portion 31, a first tubular portion 32, a second tubular portion 33, a connecting portion 34, and a recess 35 surrounding the connecting portion 34. The flange portion 31 has a diameter larger than that of the connector mounting hole 2h, and is located outside the battery cell accommodating portion 2c around the opening of the connector mounting hole 2h. The collar portion 31 has a convex portion 31a. The convex portion 31a is a portion protruding along the outer surface of the battery cell accommodating portion 2c. A pair of protrusions 2e are provided on the back surface of the battery cell accommodating portion 2c. The convex portion 31a of the flange portion 31 is located between the pair of protrusions 2e. The pair of protrusions 2e are rotation prevention portions that prevent the waterproof charging connector 30 from rotating by sandwiching the protrusion 31a of the flange portion 31. This makes it possible to prevent the nut 37 from loosening and the waterproof charging connector 30 from coming off. The collar 31 and the lid 40 are connected to each other by a flexible connecting portion 45. As shown in FIG. 6, an annular seal member 36 is provided on one surface of the flange portion 31 and on the surface of the battery cell accommodating portion 2c facing the peripheral surface of the connector mounting hole 2h. The seal member 36 is watertightly sealed between the one surface of the flange portion 31 and the peripheral surface of the connector mounting hole 2h of the battery cell accommodating portion 2c.

The first tubular portion 32 extends from the flange portion 31 diagonally upward and rearward. The outer peripheral portion of the first tubular portion 32 is a male screw portion. A columnar connecting portion 34 is provided inside the first tubular portion 32. The connecting portion 34 faces the rear diagonally upper side. An annular recess (recessed groove) 35 exists around the connecting portion 34, that is, between the outer peripheral surface of the connecting portion 34 and the inner peripheral surface of the first tubular portion 32. The second tubular portion 33 extends diagonally forward and downward from the flange portion 31. The outer peripheral portion of the second tubular portion 33 is a male screw portion for attaching the lid 40. The second cylindrical portion 33 penetrates the connector mounting hole 2h and extends inside the battery cell accommodating portion 2c. A nut 37 as a fixing member is screwed to the outer peripheral portion of the second tubular portion 33. As a result, the waterproof charging connector 30 is fixed to the connector mounting hole 2h.

The lid 40 has an outer cylinder portion 41 and an inner cylinder portion 42. The outer cylinder portion 41 has a double structure divided into two in the radial direction of the lid 40, and holds the magnet 43 inside the double structure. As shown in FIG. 11, the magnet 43 is an annular permanent magnet and has magnetic poles on one side and the other side in the central axis direction of the lid 40. The inner peripheral portion of the outer cylinder portion 41 is a female screw portion. The lid 40 is attached to the waterproof charging connector 30 (the lid 40 is closed) by screwing the inner peripheral portion of the outer cylinder portion 41 to the outer peripheral portion of the second tubular portion 33 of the waterproof charging connector 30. With the lid 40 attached to the waterproof charging connector 30, the inner cylinder portion 42 fits into the recess 35 of the waterproof charging connector 30. This enhances waterproofness. The axis b shown in FIG. 3 is the connector mounting hole 2h, the first cylindrical portion 32 and the second tubular portion 33 of the waterproof charging connector 30, and the central axis of the lid 40, and the direction thereof is the above-mentioned axis c. It is perpendicular to the direction.

A lid attachment / detachment sensor 38 is provided on the inner surface of the battery cell accommodating portion 2c and in the vicinity of the connector mounting hole 2h. The lid attachment / detachment sensor 38 is a magnetic sensor such as a Hall IC, and detects a magnetic field generated by a magnet 43 provided on the lid 40. The wiring 39 electrically connects the lid attachment / detachment sensor 38 and the control board 20. When the lid 40 is attached to the waterproof charging connector 30, a stronger magnetic field is applied from the magnet 43 to the lid attachment / detachment sensor 38 as compared with the state where the lid 40 is removed from the waterproof charging connector 30. Therefore, the attachment / detachment (opening / closing) of the lid 40 can be detected based on the magnetic field detection result of the lid attachment / detachment sensor 38. The calculation unit 50 of FIG. 12, which will be described later, requires that the closed state of the lid 40 is detected by the lid attachment / detachment sensor 38 (the state of FIG. 7) as a condition for driving the motor 3. The calculation unit 50 does not drive the motor 3 in a state where the closed state of the lid 40 is not detected by the lid attachment / detachment sensor 38 (state in FIG. 10).

FIG. 12 is a circuit block diagram of the power tool 1. The control board 20 includes a calculation unit 50 as a control unit, a control system power supply circuit 51, a current detection circuit 52, a switch detection circuit 53, a motor control signal circuit (control signal output circuit) 54, a rotation position detection circuit 55, and a rotation speed. A detection circuit 56, a temperature detection circuit 57, and a battery cell control circuit (battery cell control unit) 59 are provided.

The calculation unit 50 includes a microcontroller and controls the entire operation of the power tool 1. The control system power supply circuit 51 converts the output voltage of the battery cell 26 into the power supply voltage of the arithmetic unit 50 or the like. The current detection circuit 52 detects the current flowing through the motor 3 by the voltage of the resistor R provided in the current path of the motor 3 and transmits it to the calculation unit 50. The switch detection circuit 53 detects the operation of the trigger 10 by the output signal of the trigger sensor 15 and transmits it to the calculation unit 50. The motor control signal circuit 54 applies a control signal such as a PWM signal to each control terminal (each gate) of each switching element constituting the inverter circuit 60 under the control of the calculation unit 50. Drive power is supplied from the battery cell 26 to the motor 3 via the inverter circuit 60 that has received the control signal.

The rotation position detection circuit 55 detects the rotation position of the motor 3 by the output signal of a magnetic sensor such as a Hall IC (not shown) provided in the vicinity of the motor 3 and transmits it to the calculation unit 50 and the rotation speed detection circuit 56. The rotation speed detection circuit 56 detects the rotation speed of the motor 3 by the output signal of the rotation position detection circuit 55 and transmits it to the calculation unit 50. The temperature detection circuit 57 detects the temperature of each switching element of the inverter circuit 60 by the output signal of the temperature sensor 58 such as a thermistor provided in the vicinity of the inverter circuit 60, and transmits the temperature to the calculation unit 50. The calculation unit 50 controls on / off of each switching element of the inverter circuit 60 via the motor control signal circuit according to the operation of the trigger 10 and the rotation position and rotation speed of the motor 3, for example, PWM control, and drives the motor 3. To control.

The battery cell control circuit 59 is electrically connected to the waterproof charging connector 30, the lid attachment / detachment sensor 38, the battery cell 26, and the calculation unit 50. In FIG. 12, the signal line connecting the battery cell control circuit 59 and the calculation unit 50 is not shown. The battery cell control circuit 59 may be a part of the function of the calculation unit 50. The battery cell control circuit 59 receives the lid attachment / detachment signal from the lid attachment / detachment sensor 38 and transmits it to the calculation unit 50. The wiring 24 between the battery cell control circuit 59 and the waterproof charging connector 30 includes a power line 24a and a communication line (signal line) 24b. The waterproof charging connector 30 has a power supply terminal and a communication terminal (signal terminal) that are electrically connected to the power line 24a and the signal line 24b. The communication line 24b is a signal line for detecting that the waterproof charging connector 30 and the charger are securely connected (the charging plug is securely connected to the waterproof charging connector 30), and various other types. Includes signal lines for transmitting and receiving signals. The battery cell control circuit 59 supplies the charging current to the battery cell 26, acquires the cell voltage of the battery cell 26, and transmits the cell voltage to the calculation unit 50.

FIG. 13 is a schematic operation explanatory view of the power tool 1. When the waterproof charging connector 30 and the charger are connected, the battery cell 26 is charged (S1). When the voltage of the battery cell 26 reaches the full charge voltage, charging is stopped (S2). Also, when various errors occur, charging is stopped (S2). Various errors are high temperature abnormalities of the battery cell 26 and the like. When the waterproof charging connector 30 and the charger are connected, the calculation unit 50 keeps the motor 3 in the stopped state even when the trigger 10 is turned on (S3).

When the waterproof charging connector 30 and the charger are not connected, the calculation unit 50 drives the motor 3 when the trigger 10 is turned on (S9). The calculation unit 50 stops the motor 3 when the trigger 10 is turned off (S8). The calculation unit 50 also stops the motor 3 even when various errors occur (S8). Various errors are high temperature abnormality and overcurrent abnormality of the switching element of the inverter circuit 60.

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

(1) By incorporating (accommodating) the battery cell 26 in the housing 2 (battery cell accommodating portion 2c), it is possible to reduce the air window of the detachable battery pack and the gap in the battery attachment / detachment portion, and improve the waterproof property. be able to. Although it is necessary to provide the connector mounting hole 2h in the housing 2, the connector mounting hole 2h is watertightly closed (with high waterproofness) by the waterproof charging connector 30 having a waterproof structure and the lid 40 that can open and close the connector 40. Further, the trigger 10 and the sensor substrate 13 are separated by a wall portion 2d of the housing 2. Therefore, the housing 2 can be configured to have no opening (wind window or the like) communicating with the outside including the periphery of the trigger 10, and can realize high waterproofness or airtightness as a whole.

(2) Since the connector mounting hole 2h is provided in the right housing 2f, the connector mounting hole 2h is formed by combining the right housing 2f and the left housing 2g (the right housing 2f forms the right half of the connector mounting hole 2h). Unlike the configuration in which the left housing 2g has the left half of the connector mounting hole 2h), the mating surface between the right housing 2f and the left housing 2g due to the stress applied to the housing 2 when the charging plug is attached to and detached from the waterproof charging connector 30. The (divided surface) can be opened to reduce the risk of water entering the housing 2, and the waterproof property is enhanced.

(3) In the case of a configuration in which the connector mounting hole 2h is formed by combining the right housing 2f and the left housing 2g, at the time of assembly, after combining the right housing 2f and the left housing 2g, the waterproof charging connector 30 is inserted into the connector mounting hole 2h. It becomes a procedure of attaching, and the nut 37 inside the housing 2 cannot be turned. On the other hand, in the electric tool 1, since the connector mounting hole 2h is provided in the right housing 2f, the waterproof charging connector 30 can be attached to the connector mounting hole 2h before combining the right housing 2f and the left housing 2g, and the nut. 37 is easy to turn and easy to assemble.

(4) By providing the waterproof charging connector 30 other than the lower surface of the battery cell accommodating portion 2c, the lower surface of the battery cell accommodating portion 2c is in contact with the lower surface of the battery cell accommodating portion 2c, unlike the case where the waterproof charging connector 30 is arranged on the lower surface of the battery cell accommodating portion 2c. The electric tool 1 can be made to stand on its own as the ground, and the electric tool 1 can be charged while being independent, which is highly convenient.

(5) If the waterproof charging connector 30 is placed on the front side or left and right of the battery cell accommodating portion 2c, the waterproof charging connector 30 interferes with the work, but the waterproof charging connector 30 is placed on the opposite side (worker side) from the tip tool 9. By arranging the connector 30, the waterproof charging connector 30 does not get in the way during work and mounting, and the workability is good and the convenience is high.

(6) Since the stator coil of the motor 3 is covered with the heat radiating material 4, the heat generation of the motor 3 can be suitably suppressed even if there is no cooling air from the fan.

(7) By stacking a plurality of battery cells 26 in a bale and increasing the number of battery cells in the lowermost stage to be larger than the number of battery cells in the uppermost stage, the center of gravity of the power tool 1 is lowered and the power tool 1 is stably placed. can do. Further, the control board 20 can be arranged in the empty space at the uppermost stage, which is advantageous for miniaturization of the power tool 1.

(8) Since the convex portion 31a of the flange portion 31 of the waterproof charging connector 30 is sandwiched between the pair of protruding portions 2e of the housing 2 to prevent rotation, waterproof charging is performed when the charging plug is attached to or detached from the waterproof charging connector 30. It is possible to prevent the connector 30 from rotating and coming off the housing 2.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. 14 and 15. This embodiment relates to a power tool 1A. Hereinafter, the differences from the first embodiment will be mainly described. The housing 2 is divided into three parts, a right housing 2i, a left housing 2j, and an intermediate housing 2k. The intermediate housing 2k is sandwiched between the right housing 2i and the left housing 2j. The intermediate housing 2k has a connector mounting hole similar to the connector mounting hole 2h in FIG. In this embodiment, the intermediate housing 2k corresponds to the connector connection portion. Other points of the present embodiment are the same as those of the first embodiment. The present embodiment can also have the same effect as that of the first embodiment.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. 16 and 17. This embodiment relates to a power tool 1B. The power tool 1B is a cordless type grinder. In this embodiment, the technical idea regarding waterproofing of the first embodiment is applied to a grinding machine. The rotation of the motor 3 drives the tip tool 9 such as a grindstone to rotate. The body portion 2a of the housing 2 is not only a motor accommodating portion but also a handle portion. A battery cell accommodating portion 2c is provided at the rear end portion of the body portion 2a. A waterproof charging connector 30 is provided on the rear end surface of the battery cell accommodating portion 2c. The power tool 1B is not self-supporting, but has high waterproofness.

Although the present invention has been described above by taking the embodiment as an example, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. The power tool of the present invention is not limited to the impact driver and the grinder, and may be other types such as a circular saw. The motor may be a brushed motor.

1, 1A, 1B Electric tool (working machine), 2 housing, 2a body part (cylindrical part), 2b handle part, 2c battery cell housing part, 2d wall part, 2e protrusion (rotation prevention part), 2f right housing , 2g left housing, 2h connector mounting hole (connector connection), 2i right housing, 2j left housing, 2k intermediate housing, 3 motor (electric motor), 3a output shaft, (rotary shaft) 4 radiator, 9 tip tool, 10 Trigger (operation unit), 11 Spring, 12 Board case, 13 Sensor board, 15 Trigger sensor (Hall IC), 16 Magnet (Permanent magnet), 17 Inverter board, 20 Control board, 21 Operation panel, 22-25 wiring, 26 Battery cell, 27 Separator, 30 Waterproof charging connector (connector part), 31 flange part, 31a convex part, 32 1st tubular part, 33 2nd tubular part, 34 connection part, 35 concave part, 36 Seal member (water) (Tight seal material), 37 nut (connector fixing nut), 38 lid attachment / detachment sensor (hole IC), 39 wiring, 40 lid (lid), 41 outer cylinder, 42 inner cylinder, 43 magnet (permanent magnet), 45 Connection part, 50 Calculation part (control part), 51 Control system power supply circuit, 52 Current detection circuit, 53 Switch detection circuit, 54 Motor control signal circuit, 55 Rotation position detection circuit, 56 Rotation number detection circuit, 57 Temperature detection circuit , 58 temperature sensor, 59 battery cell control circuit, 60 inverter circuit.

Claims (15)

A power tool having a tip tool, a motor, a battery cell, and a housing.
The housing includes a body portion for accommodating the motor, a handle portion having one end connected to the body portion, and a battery cell accommodating portion connected to the other end of the handle portion.
One end of the battery cell accommodating portion is connected to the handle portion, and the battery cell accommodating portion is connected to the handle portion.
A connector portion electrically connected to the battery cell is arranged so as to be exposed on the outside of the housing on any of the battery cell housing portions other than the other end side.
A lid portion that covers the connector portion so as to be openable and closable is provided.
A power tool that features that. The power tool according to claim 1, wherein the connector portion is arranged on the side opposite to the tip tool of the battery cell accommodating portion in a direction parallel to the output shaft of the motor. The power tool according to claim 1 or 2, wherein the long axis direction of the battery cell is a direction in which the motor intersects the output axis direction. One of claims 1 to 3, wherein in the battery cell accommodating portion, the battery cells are stacked in a bale, and the number of battery cells in the lowermost stage is larger than the number of battery cells in the uppermost stage. The power tool described in the section. The power tool according to claim 4, wherein a substrate is provided near the upper end of the battery cell accommodating portion. The power tool according to any one of claims 1 to 5, wherein the housing does not have a wind window, and at least a part of the motor is covered with a resin heat radiating material. The housing is a split housing.
The connector is arranged at a place other than the mating surface of the split housing.
The power tool according to any one of claims 1 to 6, wherein the power tool is characterized by the above. A power tool having a tip tool, a motor, a battery cell, and a housing.
The housing is a split housing.
A connector portion electrically connected to the battery cell is arranged at a position other than the mating surface of the split housing.
A power tool that features that. The power tool according to claim 8, wherein the connector portion is fixed to a connector connection portion provided in either of the divided housings. The power tool according to claim 8, wherein the connector portion is sandwiched by the split housing and fixed to the connector connection portion. The power tool according to claim 9 or 10, wherein the connector connection portion is located in the battery cell accommodating portion. The power tool according to any one of claims 8 to 11, wherein the connector connection portion is provided on the side opposite to the tip tool. The power tool according to any one of claims 7 to 12, wherein the split housing is a left and right split housing. The power tool according to any one of claims 1 to 13, wherein a rotation prevention portion for preventing rotation of the connector is provided in the housing. The power tool according to any one of claims 1 to 14, wherein the connector portion has a communication terminal.

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